1978 Chevrolet K20 Transmission Parts

Essential 1978 Chevrolet K20 Transmission Parts

ATP – AT MODULATOR VALVE (Part No.JX-76)

AT MODULATOR VALVE

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$48.99
AT MODULATOR VALVE

National – Multi Purpose Seal (Part No.5208)

Multi Purpose Seal

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$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.

Product Features:
  • Low swell in hydrocarbon fluids
  • Design type: spring loaded; multi-lip
  • Provides good low temperature capability
  • Temperature range: -40°F to 225°F; -40°C to 107°C
  • Delivers quality and reliable performance for every type of repair
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ATP – AT SHIFT KIT (Part No.SK-2)

AT SHIFT KIT

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$189.99
AT SHIFT KIT

B & M – Transmission Accessories, Converter Lockup Controller (Part No.70244)

Transmission Accessories, Converter Lockup Controller

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$309.99
The B&M converter lockup controller provides dash-mounted control to govern converter lockup at any speed between 30 and 90 mph. These kits eliminate converter lock and unlock cycling and premature unwanted converter lockup.

Product Features:
  • Dash Mounted Control For Speeds Between 30-90 mph
  • LED Indicates Locked OR Unlocked
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Driveworks – Taper Bearing Cup (Part No.S-M-88010)

Taper Bearing Cup

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$5.29
Value-priced bearing meets all cataloged application requirements.

Product Features:
  • Brand may vary by location
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Driveworks – Auto Transmission Shift Shaft Seal (Part No.S-8792S)

Auto Transmission Shift Shaft Seal

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$2.49
Product Features:
  • Brand may vary by location
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B & M – Governor Recalibration Kit For TH-700R4, TH-400 and TH-350 Transmission (Part No.20248)

Governor Recalibration Kit For TH-700R4, TH-400 and TH-350 Transmission

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$109.99
This kit allows you to adjust the shift points of your transmission after it is installed in your vehicle. The Governor Recalibration Kit is very useful if you have a vehicle that is very light; has a low rear-end gear ratio.

Product Features:
  • Adjust Shift Points Of Transmission
  • Useful For Light Vehicles
  • For Low Rear End Gear Ratio
  • Or Useful If It Is Conversion
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National – Bearings (Part No.307-L)

Bearings

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$39.49
National Oil Seals & Bearings offer a full line of premium oil seals and bearings.

Product Features:
  • Premium bearing design matches OEM specifications
  • Precision manufactured using premium-grade steel for outstanding durability and performance
  • Controlled heat treating process for lasting performance and extended bearing life
  • Industry leading coverage
  • Professional technicians know they can depend on National
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Dorman – Clutch Pilot Bushing (Part No.690-014.1)

Clutch Pilot Bushing

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$7.99
This clutch pilot bushing is designed to match the fit and function of the original part on specified vehicles. Made of quality materials, it is engineered for reliable performance.

Product Features:
  • Direct replacement – this clutch pilot bushing matches the fit and function of the factory part on specified years, makes and models
  • Ideal solution – this bushing is a reliable replacement for an original part that has failed due to fatigue
  • Durable construction – this part is made from quality materials to ensure reliable performance and long service life
  • Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
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National – Bearings (Part No.A-35)

Bearings

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$25.99
National Oil Seals & Bearings offer a full line of premium oil seals and bearings.

Product Features:
  • Premium bearing design matches OEM specifications
  • Precision manufactured using premium-grade steel for outstanding durability and performance
  • Crowned raceways and rollers to ensure even load distribution for maximum life
  • Industry leading coverage
  • Professional technicians know they can depend on National
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B & M – Transmission Cast Deep Pan, Brushed Finish TH-350 (Part No.30280)

Transmission Cast Deep Pan, Brushed Finish TH-350

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$269.99
These B&M automatic transmission deep pans provide additional fluid capacity and cooling ability. No modifications to the dipstick are needed. They include a drain plug for clean and easy fluid changes. Adds 3 quarts to the Transmission.

Product Features:
  • Additional Oil Capacity
  • More Cooling Ability
  • No Dipstick Modification
  • Some Include Fluid Pickup Extension
  • Built-In Drain Plugs
  • Cast Aluminum
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ATP – AT OIL PUMP GASKET (Part No.SG-27)

AT OIL PUMP GASKET

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$10.99
AT OIL PUMP GASKET

Imperial – Plate and Fin Style Trans Cooler 3/4" x 9-1/2" x 11" Heavy Duty (Part No.243008)

Plate and Fin Style Trans Cooler 3/4" x 9-1/2" x 11" Heavy Duty

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$80.99
Product Features:
  • Imperial Rapid-Cool« plate and fin transmission cooler
  • Size: 3/4″ x 11″ x 9-1/2″
  • Pickup trucks and vans, class “C” motor homes, travel trailers to 24′
  • GVWR up to 24,000 lbs.; towing up to 5,000 lbs.
  • 33% more efficient than a comparable tube and fin design
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Carquest Premium – Back Up Light Switch (Part No.SBA4462)

Back Up Light Switch

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$24.99
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
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National – Bearings (Part No.M802048)

Bearings

from

$23.99
National Oil Seals & Bearings offer a full line of premium oil seals and bearings.

Product Features:
  • Premium bearing design matches OEM specifications
  • Precision manufactured using premium-grade steel for outstanding durability and performance
  • Crowned raceways and rollers to ensure even load distribution for maximum life
  • Industry leading coverage
  • Professional technicians know they can depend on National
See More

Mr. Gasket – Chrome Automatic Transmission Oil Pan with Drain Plug (Part No.9732)

Chrome Automatic Transmission Oil Pan with Drain Plug

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$65.99
Stock depth chrome plated automatic transmission pans are complete with drain plug, washer and gasket. Matching dipsticks with tubes sold separately.

Product Features:
  • Stock depth and capacity
  • Chrome plated
  • Includes drain plug/washer/gasket
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ATP – AT DETENT CABLE SEAL (Part No.SO-36)

AT DETENT CABLE SEAL

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$3.99
AT DETENT CABLE SEAL

ATP – AT SEL SHAFT SEAL (Part No.SO-19)

AT SEL SHAFT SEAL

from

$7.99
AT SEL SHAFT SEAL

Moveras – TH350 – Automatic Transmission (Part No.M01649AA)

TH350 - Automatic Transmission

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$1339.99
Moveras Remanufactured Transmissions manufactures automatic transmissions for virtually every vehicle on the road.

Product Features:
  • Product might not be available in all states due to local laws.
  • We are committed to remanufacturing transmissions to the same stAndards And methodologies used for OEM transmissions
  • Each Moveras transmission is produced in a World Class manufacturing facility
  • Our entire process has been developed from scratch, utilizing LEAN manufacturing principles
  • Our transmissions are produced in a Clean Room environment
  • Every transmission is built to the same exacting standards by using a precisely documented and controlled process.
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National – Multi Purpose Seal (Part No.8792S)

Multi Purpose Seal

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.

Product Features:
  • Low swell in hydrocarbon fluids
  • Design type: spring loaded; multi-lip
  • Provides good low temperature capability
  • Temperature range: -40°F to 225°F; -40°C to 107°C
  • Delivers quality and reliable performance for every type of repair
See More

ARP Auto Racing – For Use With 90 Degree V6 Chevy/ 265 And 454 V8 With 2 Piece Rear Seal (Part No.200-2902)

For Use With 90 Degree V6 Chevy/ 265 And 454 V8 With 2 Piece Rear Seal

from

$19.79
Flywheel and flex plate bolts play an important role in the performance and safety of race cars and street machines alike. That is why the fastener experts at ARP have developed special bolts that are far superior to OEM hardware. ARP offers two styles of flywheel/flex plate bolts: High Performance and Pro Series. They are both forged from aerospace alloy and heat treated prior to thread rolling and machining. Both feature an exclusive, flat, 12 point head design and larger than stock shank diameter for increased strength and improved flywheel register. The popular High Performance series is rated at 180,000 PSI, and the premium grade Pro Series, originally developed for NASCAR competition, has a 200,000 PSI rating. Complete with washers and nuts where applicable.

Product Features:
  • Forged From Aerospace Alloy And Heat Treated Prior To Thread Rolling And Machining
  • Feature An Exclusive, Flat, 12 Point Head Design And Larger Than Stock Shank Diameter
  • Flanged Nut
  • Increased Strength And Improved Flywheel Register
  • Chevy 90░ V6 & 265-454 With 2-pc Rear Seal, Ford 289-460
  • 0.68″ Underhead Length
  • 200,000 PSI
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ATP – AT SEAL (Part No.SO-39)

AT SEAL

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$5.99
AT SEAL

Anchor – Transmission Mount: Rear, 1 Piece (Part No.2638)

Transmission Mount: Rear, 1 Piece

from

$23.49
The purpose of the mount is to support the engine and transmission on the chassis and dampen vibration and noise from reverberating to the rest of the vehicle. Engine and Transmission Mounts are engineered and manufactured to meet or exceed OEM specifications using the latest CAD/CAM engineering process to ensure superior quality, form, fit and function. Only premium quality materials are used in the manufacturing process to guarantee precise performance and maximum durability. Applicable to CADI 99-14; CHEV 82-19; GMC 82-14; HUMMER 03-10; ISUZU 06-08; OLDS 91-94;. Please verify your application.

Product Features:
  • MAXIMUM LIFE & PERFORMANCE: Both natural and SBR (Styrene Butadiene) rubber provide good abrasion resistance and aging stability to ensure maximum life and performance.
  • MEETS OR EXCEEDS DUROMETER MEASUREMENTS: All rubber material is manufactured to specific Durometer (hardness) measurements based on the vehicle’s application requirements.
  • HARDENED STEEL FASTENERS: All fasteners are made of hardened steel with heat treated Grade #5 bolts.
  • SUPERIOR BOND: A special Chemlock® bonding agent is used to ensure a superior rubber-to-metal bond.
  • HYDRAULIC MOUNT DESIGN: Hydraulic Mounts (applicable where OE) are designed for most front wheel drive vehicles because transverse drive train mounting.
  • For Years: 1982-2019
  • Weight approx: 5 Lbs
  • STUDS: M10-150
  • INTERLOCK
  • BOLT HOLES CENTERLINE: 7.5 INCH / 190.5 MM
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Felpro – Manual Transmission Gasket Set (Part No.TS 80161)

Manual Transmission Gasket Set

from

$28.49
Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:
  • Meets or exceeds all original equipment specifications
  • Application specific design to ensure a perfect fit
  • Engineered and manufactured specifically for the repair environment
  • Unsurpassed quality you can trust
  • Includes all parts needed to complete the repair
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B & M – Traveler Converter (Part No.30423)

Traveler Converter

from

$413.99
Torque Converter – Traveler Converter (SUV and Light Truck) for GM 1968 to 1981 TH350, TH375B APPLICATION: GM 1968 to 1981 TH350, TH375B (6) (will not fit TH-350C) Provides slightly higher stall speed than stock to improve pulling power at low speeds. New

Product Features:
  • Ideal For Motor Homes
  • Ideal For Towing Applications
  • Precision Pump Drive Tube
  • Heavy Duty Needle Bearings
  • Furnace Brazed
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Pro-King – Automatic Transmission Remanufactured Torque Converter (Part No.GM18A)

Automatic Transmission Remanufactured Torque Converter

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$178.99
Remanufactured using industry-leading techniques to assure enhanced torque performance and extended life. Each unit is harmonically balanced and leak tested with any inherent OE weaknesses corrected. Pro-King torque converters are subject to random ISO 9001 quality tests before leaving the factory.

Product Features:
  • Fluid Balanced
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Felpro – Manual Transmission Gasket Set (Part No.TS 30118)

Manual Transmission Gasket Set

from

$24.49
Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:
  • Meets or exceeds all original equipment specifications
  • Application specific design to ensure a perfect fit
  • Engineered and manufactured specifically for the repair environment
  • Unsurpassed quality you can trust
  • Includes all parts needed to complete the repair
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Felpro – Manual Transmission Gasket Set (Part No.TS 80108)

Manual Transmission Gasket Set

from

$9.29
Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:
  • Meets or exceeds all original equipment specifications
  • Application specific design to ensure a perfect fit
  • Engineered and manufactured specifically for the repair environment
  • Unsurpassed quality you can trust
  • Includes all parts needed to complete the repair
See More

Popular 1978 Chevrolet K20 Transmission Parts Categories

1978 Chevrolet K20 Transmission Parts

You count on your 1978 Chevrolet K20 to run right. That means taking care of it with regular maintenance, necessary repairs, and the right parts. Advance Auto Parts can help with all of that thanks to our extensive inventory of trusted Transmission Parts. With 151 Transmission Parts ranging in price from $1.99 to $1,339.99, you’re sure to find everything you need for your 1978 Chevrolet K20.

Brands matter. If you want to shop a specific Transmission Parts brand, we stock 19 different brands like National, Imperial, and ATP. 1978 Chevrolet K20 Transmission Parts start as low as $1.99!

One of the best ways to find top quality OEM or aftermarket Transmission Parts is by asking professionals. Short of that, you can shop with confidence thanks to our 3,962 extensive product reviews on 1978 Chevrolet K20 Transmission Parts. Some of the top-rated Transmission Parts products we carry are Multi Purpose Seal with 4.4 stars and Automatic Shifter, Z-Gate with 4.4 stars.

Did we mention you can order your Transmission Parts from our online catalog and have them shipped right to your garage? Or, if you feel like seeing the parts first-hand, search for your nearest Advance Auto Parts location above and pick up in-store when you’re ready. Browse our full Transmission Parts inventory for your 1978 Chevrolet K20 below to get started!

Top-Rated Transmission Parts Brands For Your 1978 Chevrolet K20

Trusted Transmission Parts OEM and aftermarket product brands are what Advance Auto Parts specializes in. The brands we work with are sure to keep that 1978 Chevrolet K20 running right for years to come. In our inventory you’ll find brands like National, Imperial, ATP, and even more.

Popular Felpro Transmission Parts

You’ll find popular Felpro brand products across Automatic Transmission Pan and Gaskets. All are waiting to get your 1978 Chevrolet K20 back on the road. Some of the top-rated Felpro products in these categories are:
Transmission Oil Pan Gasket
from $8.49
(3)
Transmission Oil Pan Gasket
Transmission Oil Pan Gaskets
Transmission Oil Pan Gasket
from $9.29
(5)
Transmission Oil Pan Gasket
Transmission Oil Pan Gaskets

Top-Rated National Transmission Parts


If National are what you’re looking for, our inventory holds plenty. We stock National brand Transmission Parts for your 1978 Chevrolet K20, and some of our most reviewed National parts include:
Bearings
from $25.99
(23)
Bearings
Manual Transmission Differential Bearings
Multi Purpose Seal
from $22.29
(20)
Multi Purpose Seal
Pinion Seals
Cylindrical Bearing
from $22.99
(20)
Cylindrical Bearing
Axle Output Shaft Bearings

FAQs for 1978 Chevrolet K20 Transmission Parts

What are the most purchased Transmission Parts for the 1978 Chevrolet K20?

Out of 151 Transmission Parts for the 1978 Chevrolet K20, the most popular in our inventory are:
High Performance Transmission Oil Cooler
from $81.99
(48)
High Performance Transmission Oil Cooler
OE Transmission Coolers
Econo-Kool® Transmission Oil Cooler
from $54.99
(30)
Econo-Kool® Transmission Oil Cooler
OE Transmission Coolers
Econo-Kool® Transmission Oil Cooler
from $39.99
(10)
Econo-Kool® Transmission Oil Cooler
OE Transmission Coolers

What are the top-rated 1978 Chevrolet K20 Transmission Parts?

Top-rated Transmission Parts for your 1978 Chevrolet K20 based on customer reviews/ratings are:
Multi Purpose Seal
from $6.99
(20)
Multi Purpose Seal
“The product works well”
Automatic Shifter, Z-Gate
from $279.99
(11)
Automatic Shifter, Z-Gate
“Good Product, Great For The Price”
Automatic Transmission Vacuum Modulator
from $34.49
(11)
Automatic Transmission Vacuum Modulator
“worked”