1978 GMC K25 Transmission Seals

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Keep Your 1978 GMC K25 in Top Shape with Quality Transmission Seals

Whether you’re repairing or upgrading your Transmission Seal, using high-quality parts is key to keeping your 1978 GMC K25 looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Automatic Transmission Output Shaft Seals, Extension Housing Seals, and Transmission Seals and O-rings. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.

Top-Rated Transmission Seals from Trusted Brands

Looking for a reliable Transmission Seal? We’ve got you covered with options from brands you know and trust like National and Driveworks. For example, National Transmission Seals start at just $10.99 with an average 4.3 star rating. Driveworks offer similar pricing and quality, backed by strong customer feedback. With over 436 reviews and a solid 4.7 star average, you can shop with confidence knowing other GMC K25 owners approve.

Find Your Specific 1978 GMC K25 Transmission Seals

Looking for the perfect Transmission Seal for your 1978 GMC K25? You’re in the right place. Below, you’ll find links to various types of Transmission Seals that fit your vehicle. At Advance Auto Parts, we offer only the highest quality OEM and aftermarket Transmission Seals, ensuring durability and a precise fit for your GMC K25. Whether you’re driving a 1978 model or another popular model year like 1975, 1976, and 1977, we’ve got you covered. Purchasing Transmission Seals from Advance Auto Parts is a smart choice, giving you access to trusted brands and parts built to perform. Below, you’ll find links to various types of Transmission Seals that fit your vehicle.

Essential 1978 GMC K25 Transmission Seals

ATP – ATP Automatic Transmission Selector Shaft Seal, SO-19 (Part No.SO-19)

ATP Automatic Transmission Selector Shaft Seal, SO-19

from

$9.59
ATP Transmission Seals and Gaskets are exact fit, no compromise replacement parts
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(2 reviews)
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Driveworks – Driveworks Oil Seal, S-6712NA (Part No.S-6712NA)

Driveworks Oil Seal, S-6712NA

from

$6.49
Value-priced seal meets all cataloged application requirements.
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National – National Multi-Purpose Seal, 473468 (Part No.473468)

National Multi-Purpose Seal, 473468

from

$19.29
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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ATP – ATP Automatic Transmission Speedometer Pinion Seal, SO-34 (Part No.SO-34)

ATP Automatic Transmission Speedometer Pinion Seal, SO-34

from

$10.79
ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts
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Driveworks – Driveworks Oil Seal, S-5208 (Part No.S-5208)

Driveworks Oil Seal, S-5208

from

$21.29
Driveworks Oil Seal, S-5208. BEARINGS, SEALS, HUB ASSEMBLIES>BEARINGS & SEALS>SEALS>ECONOMY SEALS from Driveworks
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National – National Engine Crankshaft Seal, 5092 (Part No.5092)

National Engine Crankshaft Seal, 5092

from

$50.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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Schaeffler – Schaeffler Shaft Seal, SS2569 (Part No.SS2569)

Schaeffler Shaft Seal, SS2569

from

$3.99
Our wheel seals are engineered using only the highest-quality materials to meet vehicle manufacturer specificatons. We work with suppliers to design seals that meet FAG’s quality standards. Seals are designed to protect wheel end components from contamination – such as dirt, dust, and moisture – and prevent the loss of grease over the life of the bearing. The specifications for wheel seals are very demanding, and the type required depends on the specific application, position and vehicle class.
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National – National Multi-Purpose Seal, 5200 (Part No.5200)

National Multi-Purpose Seal, 5200

from

$12.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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(5 reviews)
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Schaeffler – Schaeffler Shaft Seal, SS2571 (Part No.SS2571)

Schaeffler Shaft Seal, SS2571

from

$11.99
Our wheel seals are engineered using only the highest-quality materials to meet vehicle manufacturer specificatons. We work with suppliers to design seals that meet FAG’s quality standards. Seals are designed to protect wheel end components from contamination – such as dirt, dust, and moisture – and prevent the loss of grease over the life of the bearing. The specifications for wheel seals are very demanding, and the type required depends on the specific application, position and vehicle class.
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National – National Multi-Purpose Seal, 9613S (Part No.9613S)

National Multi-Purpose Seal, 9613S

from

$7.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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(8 reviews)
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Driveworks – Driveworks Oil Seal, S-473204 (Part No.S-473204)

Driveworks Oil Seal, S-473204

from

$6.99
Driveworks Oil Seal, S-473204. BEARINGS, SEALS, HUB ASSEMBLIES>BEARINGS & SEALS>SEALS>ECONOMY SEALS from Driveworks
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National – National Shaft Repair Sleeve, 99193 (Part No.99193)

National Shaft Repair Sleeve, 99193

from

$44.49
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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(2 reviews)
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National – National Multi-Purpose Seal, 7038SA (Part No.7038SA)

National Multi-Purpose Seal, 7038SA

from

$16.79
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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ATP – ATP Automatic Transmission Extension Housing Seal, JO-57 (Part No.JO-57)

ATP Automatic Transmission Extension Housing Seal, JO-57

from

$9.59
ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts
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National – National Multi-Purpose Seal, 2287 (Part No.2287)

National Multi-Purpose Seal, 2287

from

$8.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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ATP – ATP Automatic Transmission Dipstick Tube O’Ring Seal, SO-33 (Part No.SO-33)

ATP Automatic Transmission Dipstick Tube O'Ring Seal, SO-33

from

$2.99
ATP Transmission Seals and Gaskets are exact fit, no compromise replacement parts
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National – National Multi-Purpose Seal, 5208 (Part No.5208)

National Multi-Purpose Seal, 5208

from

$21.29
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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(3 reviews)
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National – National Multi-Purpose Seal, 481181N (Part No.481181N)

National Multi-Purpose Seal, 481181N

from

$11.29
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
See More
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National – National Multi-Purpose Seal, 3638 (Part No.3638)

National Multi-Purpose Seal, 3638

from

$12.79
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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(3 reviews)
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ATP – ATP Automatic Transmission Seal, SO-39 (Part No.SO-39)

ATP Automatic Transmission Seal, SO-39

from

$5.99
ATP Transmission Seals and Gaskets are exact fit, no compromise replacement parts
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Driveworks – Driveworks Oil Seal, S-471271 (Part No.S-471271)

Driveworks Oil Seal, S-471271

from

$6.49
Value-priced seal meets all cataloged application requirements.
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(1 reviews)
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National – National Multi-Purpose Seal, 9449 (Part No.9449)

National Multi-Purpose Seal, 9449

from

$13.29
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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(2 reviews)
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National – National Differential Pinion Seal, 2043 (Part No.2043)

National Differential Pinion Seal, 2043

from

$18.29
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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(5 reviews)
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National – National Differential Pinion Seal, 2286 (Part No.2286)

National Differential Pinion Seal, 2286

from

$24.79
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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(1 reviews)
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Driveworks – Driveworks Oil Seal, S-2286 (Part No.S-2286)

Driveworks Oil Seal, S-2286

from

$14.49
Value-priced seal meets all cataloged application requirements.
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National – National Multi-Purpose Seal, 5778V (Part No.5778V)

National Multi-Purpose Seal, 5778V

from

$41.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
See More
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Motive Gear – Motive Gear Differential Pinion Seal, 5778 (Part No.5778)

Motive Gear Differential Pinion Seal, 5778

from

$9.99
Motive Gear offers some of the toughest drive train components on the market today. If you are looking for the largest line of performance ring and pinion gear options available with gear sets in a wide range of ratios for nearly every application, both on and off-road, check out Motive Gear. Motive Gear products can be found in the winner’s circle at racing events worldwide. The superior quality of Motive Gear components is the result of years of racing development, outstanding design and state-of-the-art manufacturing methods. Extensive testing is performed on all products by our in-house engineers.
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Motive Gear – Motive Gear Differential Pinion Seal, 26064030 (Part No.26064030)

Motive Gear Differential Pinion Seal, 26064030

from

$23.99
Motive Gear offers some of the toughest drive train components on the market today. If you are looking for the largest line of performance ring and pinion gear options available with gear sets in a wide range of ratios for nearly every application, both on and off-road, check out Motive Gear. Motive Gear products can be found in the winner’s circle at racing events worldwide. The superior quality of Motive Gear components is the result of years of racing development, outstanding design and state-of-the-art manufacturing methods. Extensive testing is performed on all products by our in-house engineers.
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Popular 1978 GMC K25 Transmission Seals Categories

Automatic Transmission Output Shaft Seals
Automatic Transmission Output Shaft Seals
Automatic Transmission Oil Pump Seals
Automatic Transmission Oil Pump Seals
Pinion Seals
Pinion Seals
Transmission Seals and O-rings
Transmission Seals and O-rings
Automatic Transmission Extension Housing Seal Kits
Automatic Transmission Extension Housing Seal Kits
Extension Housing Seals
Extension Housing Seals
Manual Transmission Output Shaft Seals
Manual Transmission Output Shaft Seals
Miscellaneous Automatic Transmission Seals
Miscellaneous Automatic Transmission Seals
Automatic Transmission Selector Shaft Seals
Automatic Transmission Selector Shaft Seals
Shift Shaft Seals
Shift Shaft Seals
Manual Transmission Seals
Manual Transmission Seals
Automatic Transmission Speedometer Pinion Seals
Automatic Transmission Speedometer Pinion Seals
Front Pump Seals
Front Pump Seals
Overdrive Seals
Overdrive Seals
Manual Transmission Seal Kit
Manual Transmission Seal Kit
Manual Transmission Output Shaft Seal Kits
Manual Transmission Output Shaft Seal Kits
Automatic Transmission Output Speed Sensor Seal
Automatic Transmission Output Speed Sensor Seal

Most Popular Automatic Transmission Output Shaft Seal for 1978 GMC K25s

Enhance your 1978 GMC K25 with this popular Automatic Transmission Output Shaft Seal we have in stock, for $21.29.
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National – National Multi-Purpose Seal, 5208 (Part No.5208)

National Multi-Purpose Seal, 5208

from

$21.29
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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(3 reviews)
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Best-Selling 1978 GMC K25 Extension Housing Seals

Upgrade your K25 with one of our 3 best-selling Extension Housing Seals.
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ATP – ATP Automatic Transmission Extension Housing Seal, HO-9 (Part No.HO-9)

ATP Automatic Transmission Extension Housing Seal, HO-9

from

$12.99
ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts
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ATP – ATP Automatic Transmission Extension Housing Seal, SO-22 (Part No.SO-22)

ATP Automatic Transmission Extension Housing Seal, SO-22

from

$9.59
ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts
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ATP – ATP Automatic Transmission Extension Housing Seal, JO-57 (Part No.JO-57)

ATP Automatic Transmission Extension Housing Seal, JO-57

from

$9.59
ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts
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Top-Quality Transmission Seals and O-rings for 1978 GMC K25s

Choose a high-quality OEM or aftermarket Transmission Seals and O-ring for GMC K25s and enjoy top-notch performance from $4.29.
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National – National Multi-Purpose Seal, 471271 (Part No.471271)

National Multi-Purpose Seal, 471271

from

$10.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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(3 reviews)
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National – National Multi-Purpose Seal, 9449 (Part No.9449)

National Multi-Purpose Seal, 9449

from

$13.29
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
See More

(2 reviews)
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Driveworks – Driveworks Oil Seal, S-471271 (Part No.S-471271)

Driveworks Oil Seal, S-471271

from

$6.49
Value-priced seal meets all cataloged application requirements.
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(1 reviews)
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ATP – ATP Automatic Transmission Fluid Filler Tube Seal, JO-15 (Part No.JO-15)

ATP Automatic Transmission Fluid Filler Tube Seal, JO-15

from

$4.29
ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts
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(2 reviews)
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ATP – ATP Automatic Transmission Dipstick Tube Seal, SO-35 (Part No.SO-35)

ATP Automatic Transmission Dipstick Tube Seal, SO-35

from

$6.39
ATP Transmission Seals and Gaskets are exact fit, no compromise replacement parts
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(7 reviews)
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National – National Multi-Purpose Seal, 8792S (Part No.8792S)

National Multi-Purpose Seal, 8792S

from

$6.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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(20 reviews)
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National – National Multi-Purpose Seal, 3638 (Part No.3638)

National Multi-Purpose Seal, 3638

from

$12.79
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
See More

(3 reviews)
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Driveworks – Driveworks Oil Seal, S-9449 (Part No.S-9449)

Driveworks Oil Seal, S-9449

from

$7.79
Value-priced seal meets all cataloged application requirements.
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(4 reviews)
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National – National Multi-Purpose Seal, 240735 (Part No.240735)

National Multi-Purpose Seal, 240735

from

$5.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
See More
View Product

ATP – ATP Automatic Transmission Seal, SO-39 (Part No.SO-39)

ATP Automatic Transmission Seal, SO-39

from

$5.99
ATP Transmission Seals and Gaskets are exact fit, no compromise replacement parts
See More
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National – National Multi-Purpose Seal, 481181N (Part No.481181N)

National Multi-Purpose Seal, 481181N

from

$11.29
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
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Top Picks for 1978 GMC K25 Pinion Seals

Invest in one of our 6 durable Pinion Seals for your 1978 GMC, knowing you’re getting trusted brands and expert craftsmanship.
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National – National Differential Pinion Seal, 2286 (Part No.2286)

National Differential Pinion Seal, 2286

from

$24.79
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
See More

(1 reviews)
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National – National Differential Pinion Seal, 2043 (Part No.2043)

National Differential Pinion Seal, 2043

from

$18.29
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
See More

(5 reviews)
View Product

Motive Gear – Motive Gear Differential Pinion Seal, 5778 (Part No.5778)

Motive Gear Differential Pinion Seal, 5778

from

$9.99
Motive Gear offers some of the toughest drive train components on the market today. If you are looking for the largest line of performance ring and pinion gear options available with gear sets in a wide range of ratios for nearly every application, both on and off-road, check out Motive Gear. Motive Gear products can be found in the winner’s circle at racing events worldwide. The superior quality of Motive Gear components is the result of years of racing development, outstanding design and state-of-the-art manufacturing methods. Extensive testing is performed on all products by our in-house engineers.
See More
View Product

National – National Multi-Purpose Seal, 5778V (Part No.5778V)

National Multi-Purpose Seal, 5778V

from

$41.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
See More
View Product

Motive Gear – Motive Gear Differential Pinion Seal, 26064030 (Part No.26064030)

Motive Gear Differential Pinion Seal, 26064030

from

$23.99
Motive Gear offers some of the toughest drive train components on the market today. If you are looking for the largest line of performance ring and pinion gear options available with gear sets in a wide range of ratios for nearly every application, both on and off-road, check out Motive Gear. Motive Gear products can be found in the winner’s circle at racing events worldwide. The superior quality of Motive Gear components is the result of years of racing development, outstanding design and state-of-the-art manufacturing methods. Extensive testing is performed on all products by our in-house engineers.
See More
View Product

Driveworks – Driveworks Oil Seal, S-2286 (Part No.S-2286)

Driveworks Oil Seal, S-2286

from

$14.49
Value-priced seal meets all cataloged application requirements.
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Top-Rated Manual Transmission Output Shaft Seals for 1978 GMC K25s

Make a smart move for your 1978 GMC K25 with products all priced from $4.99 to $30.49.
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Driveworks – Driveworks Oil Seal, S-9613S (Part No.S-9613S)

Driveworks Oil Seal, S-9613S

from

$4.99
Value-priced seal meets all cataloged application requirements.
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(3 reviews)
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National – National Multi-Purpose Seal, 3173 (Part No.3173)

National Multi-Purpose Seal, 3173

from

$12.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
See More

(1 reviews)
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National – National Multi-Purpose Seal, 473468 (Part No.473468)

National Multi-Purpose Seal, 473468

from

$19.29
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
See More
View Product

National – National Multi-Purpose Seal, 410085 (Part No.410085)

National Multi-Purpose Seal, 410085

from

$12.99
National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
See More
View Product

Driveworks – Driveworks Oil Seal, S-99193 (Part No.S-99193)

Driveworks Oil Seal, S-99193

from

$30.49
Driveworks Oil Seal, S-99193. BEARINGS, SEALS, HUB ASSEMBLIES>BEARINGS & SEALS>SEALS>ECONOMY SEALS from Driveworks
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Top-Rated Transmission Seal Brands For Your 1978 GMC K25

When it comes to finding the perfect Transmission Seal for your 1978 GMC K25, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 5 trusted brands. We carry the most popular Transmission Seal brands including National and Driveworks, and more, all known for their exceptional customer ratings (average brand rating of 4.3 stars) and competitive prices, as low as $4.99. Purchasing a Transmission Seal from us here at Advance Auto Parts is a smart move for both you and your 1978 GMC K25, providing peace of mind with parts that meet or exceed OEM standards.

Popular National 1978 GMC K25 Transmission Seals

If you’re looking for a top-quality Transmission Seal for your 1978 GMC K25, Advance Auto Parts has exactly what you need with our selection of National Transmission Seals. We have 3 National Transmission Seals in stock for this fitment, all known for their durability and precision fit. With prices starting at just $10.99 and an average cost of $12.42, you’ll find the perfect Transmission Seal for your needs and budget. National Transmission Seals for the 1978 GMC K25 come highly rated, with over 10 customer reviews and an impressive average rating of 4.3 stars. Choosing a National Transmission Seal from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
National Multi-Purpose Seal, 9449
from $13.29
(2)
National Multi-Purpose Seal, 9449
“Sealed tbe trams leak perfectly”
National Multi-Purpose Seal, 5200
from $12.99
(5)
National Multi-Purpose Seal, 5200
“It seals great so far”
National Multi-Purpose Seal, 471271
from $10.99
(3)
National Multi-Purpose Seal, 471271
“76 k10 the truck have never rolled more smooth parts fit prefectly”

Top-Quality Driveworks 1978 GMC K25 Transmission Seals

For those in search of a high-quality Transmission Seal for their 1978 GMC K25, Advance Auto Parts offers a great selection of Driveworks Transmission Seals. With 3 Driveworks Transmission Seals in stock, you can trust you’re getting top-tier parts designed for durability and a perfect fit. Prices for these Transmission Seals start at just $4.99, with an average price of $6.42, giving you a range of options to suit your budget. Backed by over 8 customer ratings and an average rating of 4.2 stars, Driveworks Transmission Seals provide both reliability and excellent performance. Choosing a Driveworks Transmission Seal from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.
Driveworks Oil Seal, S-9613S
from $4.99
(3)
Driveworks Oil Seal, S-9613S
“Good part, cheap price”
Driveworks Oil Seal, S-9449
from $7.79
(4)
Driveworks Oil Seal, S-9449
“Couple taps of hammer and went right in”
Driveworks Oil Seal, S-471271
from $6.49
(1)
Driveworks Oil Seal, S-471271
“Perfect fit”

FAQs for 1978 GMC K25 Transmission Seals

What are the best-selling Transmission Seals for 1978 GMC K25s?

Out of 42 Transmission Seals that fit 1978 GMC K25s, the following parts are the top sellers:

What’s the price range for 1978 GMC K25 Transmission Seals?

The prices of Transmission Seals for the 1978 GMC K25 range from $2.99 up to $50.99 for the most premium parts.

What is the average price of a Transmission Seal for a 1978 GMC K25?

The average price for Transmission Seals for the 1978 GMC K25 is $14.78. Keep in mind the variety of part types within our Transmission Seal category, where you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Transmission Seals for other GMC K25 model years?

Yes, we carry Transmission Seals for 2 model years of GMC K25s between 1975 and 1977. The following model years are the most popular for Transmission Seal purchases: 1977, 1976, and 1975.

What are the cheapest Transmission Seals for my 1978 GMC K25?

The cheapest 1978 GMC K25 Transmission Seals we carry are:

Does Advance Auto Parts sell Transmission Seals for any other 1978 GMC models?

Yes. We stock Transmission Seals for 12 other popular 1978 GMC models. Some of the most popular are 1978 Jimmy Transmission Seals, 1978 Caballero Transmission Seals, 1978 K15 Transmission Seals, 1978 G25 Transmission Seals, and 1978 C25 Transmission Seals.

What are the top-rated Transmission Seals that fit the 1978 GMC K25?

The one 1978 GMC K25 Transmission Seal we have in stock is the ATP Automatic Transmission Dipstick Tube O’Ring Seal, SO-33. It costs $2.99.

What types of Transmission Seals do you sell for my 1978 GMC K25?

As of 8/2/26, these are some of the most in-demand types of Transmission Seals for a 1978 GMC K25:

Can I get help with 1978 GMC K25 Transmission Seal orders?

Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about GMC Transmission Seals and more.

What is your return policy for GMC K25 Transmission Seals?

Advance Auto Parts keeps returns simple. For new GMC K25 Transmission Seals and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.

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