1966 GMC I1000 Differentials
Keep Your 1966 GMC I1000 in Top Shape with Quality Differentials
Whether you’re repairing or upgrading your Differential, using high-quality parts is key to keeping your 1966 GMC I1000 looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Pinion Shaft Bearings, Front Differential Pinion Bearings, and Rear Differential Cover Gaskets. 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 Differentials from Trusted Brands
Looking for a reliable Differential? We’ve got you covered with options from brands you know and trust like National, FELPRO, and DriveWorks. For example, National Differentials start at just $7.99 with an average 4.3 star rating. FELPRO and DriveWorks offer similar pricing and quality, backed by strong customer feedback. With over 49 reviews and a solid 5 star average, you can shop with confidence knowing other GMC I1000 owners approve.
Competitive Prices and Extensive Inventory
The average price for a 1966 GMC I1000 Differential at Advance Auto Parts is around $18.00, with a range that starts at $7.99 and goes up to $46.99. With 9 options in stock from 3 trusted brands, finding the right fit is easy. Popular picks like Axle Housing Cover Gasket Irregular Shaped 12 Bolt Hole Gasket, Multi-Purpose Bearing, and Bearing Race start at just $9.49 and offer a great balance of form and function.
Explore Related Parts
While you’re upgrading or replacing your Differential, don’t forget to check out other key components like Drive Shafts and Axles and Transfer Cases. At Advance Auto Parts, we’re here to help you keep your 1966 GMC I1000 in peak condition, inside and out.
Find Your Specific 1966 GMC I1000 Differentials
Looking for the perfect Differential for your 1966 GMC I1000? You’re in the right place. Below, you’ll find links to various types of Differentials that fit your vehicle. At Advance Auto Parts, we offer only the highest quality OEM and aftermarket Differentials, ensuring durability and a precise fit for your GMC I1000. Whether you’re driving a 1966 model or another popular model year like
1964 and
1965, we’ve got you covered. Purchasing Differentials 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 Differentials that fit your vehicle.
Essential 1966 GMC I1000 Differentials
Felpro – Axle Housing Cover Gasket Irregular Shaped 12 Bolt Hole Gasket (Part No.RDS 13391)
from
$9.49
Fel-Pro® gaskets are specifically designed for the repair environment to deliver a reliable seal on even the most troublesome applications. Designed for imperfect sealing surfaces and manufactured with proprietary materials, you can count on Fel-Pro for innovative sealing solutions for the real-world repair environment.
Product Features:
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Product Features:
- Meets or exceeds all original equipment specifications
- Application specific design to ensure a perfect fit
- Engineered for the sealing repair environment
- Validated for fit, form and function
- Unsurpassed quality you can trust
Driveworks – Oil Seal (Part No.S-8460N)
from
$9.79
Value-priced seal meets all cataloged application requirements.
Product Features:
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Product Features:
- Brand may vary by location
National – Shaft Repair Sleeve (Part No.99170)
from
$46.99
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:
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Product Features:
- Designed to repair damaged, grooved or worn shafts
- Durable stainless steel construction for corrosion-free sealing surface that surpasses most original shaft specifications
- Ideal for a shaft where indications of seal wear, such as tracks or grooves have developed
- Ultra-thin construction (0.01/0.25mm wall thickness) allows original seal size to be used with minimal additional lip loading
- Easy to install with removable flange and installation tool
National – Multi-Purpose Bearing (Part No.A-5)
from
$16.99
Product Features:
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- CONSISTENT PERFORMANCE: Matched cup and cone components ensure consistent performance
- PREMIUM MATERIALS: Precision manufactured using premium-grade steel for outstanding durability and performance
- SMOOTH ROTATION: Crowned raceways and rollers for even load distribution
- OE-STYLE DESIGN: Engineered to meet OE specifications
- COMPREHENSIVE COVERAGE: Industry-leading coverage for domestic and import applications
- RIGOROUS TESTING: Comprehensive testing throughout design and development processes by National engineers for quality you can count on
National – Bearing Race (Part No.HM89410)
from
$10.79
Manufactured with premium-grade steel, National taper bearing cups feature crowned raceways to ensure even load distribution.
Product Features:
See More
Product Features:
- PREMIUM MATERIALS – Precision manufactured using premium-grade steel for outstanding durability and performance
- SMOOTH ROTATION – Crowned raceways for even load distribution
- OE-STYLE DESIGN – Engineered to meet OE specifications
- COMPREHENSIVE COVERAGE – Industry-leading coverage for domestic and import applications
- RIGOROUS TESTING – Comprehensive testing throughout design and development processes by National engineers for quality you can count on
FAG US – Bearing – CRB (Cylindrical Roller Bearing) (Part No.FC67147)
from
$43.99
We develop and produce high-quality roller bearings, spherical bearings, and plain bearings worldwide for a wide range of applications.
Product Features:
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Product Features:
- High-precision and High-quality components used in all KITs
- Coverage of classic and new high-tech solutions for the best system coverage
National – Bearing Race (Part No.M88010)
from
$7.99
Manufactured with premium-grade steel, National taper bearing cups feature crowned raceways to ensure even load distribution.
Product Features:
See More
Product Features:
- PREMIUM MATERIALS – Precision manufactured using premium-grade steel for outstanding durability and performance
- SMOOTH ROTATION – Crowned raceways for even load distribution
- OE-STYLE DESIGN – Engineered to meet OE specifications
- COMPREHENSIVE COVERAGE – Industry-leading coverage for domestic and import applications
- RIGOROUS TESTING – Comprehensive testing throughout design and development processes by National engineers for quality you can count on
National – Tapered Roller Bearing Cone (Part No.HM89449)
from
$22.99
Manufactured with premium-grade steel, National taper bearing cones feature crowned raceways and rollers to ensure even load distribution.
Product Features:
See More
Product Features:
- PREMIUM MATERIALS – Precision manufactured using premium-grade steel for outstanding durability and performance
- SMOOTH ROTATION – Crowned raceways and rollers for even load distribution
- OE-STYLE DESIGN – Engineered to meet OE specifications
- COMPREHENSIVE COVERAGE – Industry-leading coverage for domestic and import applications
- RIGOROUS TESTING – Comprehensive testing throughout design and development processes by National engineers for quality you can count on
National – Multi-Purpose Bearing (Part No.A-36)
from
$27.99
Product Features:
See More
- CONSISTENT PERFORMANCE: Matched cup and cone components ensure consistent performance
- PREMIUM MATERIALS: Precision manufactured using premium-grade steel for outstanding durability and performance
- SMOOTH ROTATION: Crowned raceways and rollers for even load distribution
- OE-STYLE DESIGN: Engineered to meet OE specifications
- COMPREHENSIVE COVERAGE: Industry-leading coverage for domestic and import applications
- RIGOROUS TESTING: Comprehensive testing throughout design and development processes by National engineers for quality you can count on
Felpro – Differential Carrier Gasket Round Shaped 10 Bolt Hole Gasket (Part No.RDS 4305)
from
$8.99
Fel-Pro® gaskets are specifically designed for the repair environment to deliver a reliable seal on even the most troublesome applications. Designed for imperfect sealing surfaces and manufactured with proprietary materials, you can count on Fel-Pro for innovative sealing solutions for the real-world repair environment.
Product Features:
See More
Product Features:
- Meets or exceeds all original equipment specifications
- Application specific design to ensure a perfect fit
- Unsurpassed quality you can trust
- Validated for fit, form and function
- Each Fel-Pro gasket, no matter how small, is engineered to exacting standards with proprietary design, engineering and manufacturing processes
Popular 1966 GMC I1000 Differentials Categories
Most Popular Pinion Shaft Bearing for 1966 GMC I1000s
Enhance your 1966 GMC I1000 with this popular Pinion Shaft Bearing we have in stock, for $16.99.
National – Multi-Purpose Bearing (Part No.A-5)
from
$16.99
Product Features:
See More
- CONSISTENT PERFORMANCE: Matched cup and cone components ensure consistent performance
- PREMIUM MATERIALS: Precision manufactured using premium-grade steel for outstanding durability and performance
- SMOOTH ROTATION: Crowned raceways and rollers for even load distribution
- OE-STYLE DESIGN: Engineered to meet OE specifications
- COMPREHENSIVE COVERAGE: Industry-leading coverage for domestic and import applications
- RIGOROUS TESTING: Comprehensive testing throughout design and development processes by National engineers for quality you can count on
Best-Selling 1966 GMC I1000 Front Differential Pinion Bearings
Upgrade your I1000 with one of our 2 best-selling Front Differential Pinion Bearings, earning an average 4.5 stars rating across 5 reviews.
National – Bearing Race (Part No.M88010)
from
$7.99
Manufactured with premium-grade steel, National taper bearing cups feature crowned raceways to ensure even load distribution.
Product Features:
See More
Product Features:
- PREMIUM MATERIALS – Precision manufactured using premium-grade steel for outstanding durability and performance
- SMOOTH ROTATION – Crowned raceways for even load distribution
- OE-STYLE DESIGN – Engineered to meet OE specifications
- COMPREHENSIVE COVERAGE – Industry-leading coverage for domestic and import applications
- RIGOROUS TESTING – Comprehensive testing throughout design and development processes by National engineers for quality you can count on
National – Tapered Roller Bearing Cone (Part No.HM89449)
from
$22.99
Manufactured with premium-grade steel, National taper bearing cones feature crowned raceways and rollers to ensure even load distribution.
Product Features:
See More
Product Features:
- PREMIUM MATERIALS – Precision manufactured using premium-grade steel for outstanding durability and performance
- SMOOTH ROTATION – Crowned raceways and rollers for even load distribution
- OE-STYLE DESIGN – Engineered to meet OE specifications
- COMPREHENSIVE COVERAGE – Industry-leading coverage for domestic and import applications
- RIGOROUS TESTING – Comprehensive testing throughout design and development processes by National engineers for quality you can count on
Top-Quality Rear Differential Cover Gaskets for 1966 GMC I1000s
Choose a high-quality OEM or aftermarket Rear Differential Cover Gasket for GMC I1000s and enjoy top-notch performance from $9.49.
Felpro – Axle Housing Cover Gasket Irregular Shaped 12 Bolt Hole Gasket (Part No.RDS 13391)
from
$9.49
Fel-Pro® gaskets are specifically designed for the repair environment to deliver a reliable seal on even the most troublesome applications. Designed for imperfect sealing surfaces and manufactured with proprietary materials, you can count on Fel-Pro for innovative sealing solutions for the real-world repair environment.
Product Features:
See More
Product Features:
- Meets or exceeds all original equipment specifications
- Application specific design to ensure a perfect fit
- Engineered for the sealing repair environment
- Validated for fit, form and function
- Unsurpassed quality you can trust
Our Top Pick for a 1966 GMC I1000 Differential Bearing
Invest in a
durable Differential Bearing for your 1966 GMC, knowing you’re getting trusted brands and expert craftsmanship.
National – Multi-Purpose Bearing (Part No.A-36)
from
$27.99
Product Features:
See More
- CONSISTENT PERFORMANCE: Matched cup and cone components ensure consistent performance
- PREMIUM MATERIALS: Precision manufactured using premium-grade steel for outstanding durability and performance
- SMOOTH ROTATION: Crowned raceways and rollers for even load distribution
- OE-STYLE DESIGN: Engineered to meet OE specifications
- COMPREHENSIVE COVERAGE: Industry-leading coverage for domestic and import applications
- RIGOROUS TESTING: Comprehensive testing throughout design and development processes by National engineers for quality you can count on
Our Top-Rated Differential Pinion Seals for 1966 GMC I1000s
Make a smart move for your 1966 GMC I1000 with our Differential Pinion Seal for $9.79.
Driveworks – Oil Seal (Part No.S-8460N)
from
$9.79
Value-priced seal meets all cataloged application requirements.
Product Features:
See More
Product Features:
- Brand may vary by location
Top-Rated Differential Brands For Your 1966 GMC I1000
When it comes to finding the perfect Differential for your 1966 GMC I1000, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 3 trusted brands. We carry the most popular Differential brands including FELPRO, National, and DriveWorks, and more, all known for their exceptional customer ratings (average brand rating of 4.6 stars) and competitive prices, as low as $7.99. Purchasing a Differential from us here at Advance Auto Parts is a smart move for both you and your 1966 GMC I1000, providing peace of mind with parts that meet or exceed OEM standards.
Popular FELPRO 1966 GMC I1000 Differentials
If you’re looking for a top-quality Differential for your 1966 GMC I1000, Advance Auto Parts has exactly what you need with our selection of FELPRO Differentials. We have 1 FELPRO Differentials in stock for this fitment, all known for their durability and precision fit. With prices starting at just $9.49, you’ll find the perfect Differential for your needs and budget. FELPRO Differentials for the 1966 GMC I1000 come highly rated, with over 3 customer reviews and an impressive average rating of 4.6 stars. Choosing a FELPRO Differential from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
from
$9.49
(3)
Axle Housing Cover Gasket Irregular Shaped 12 Bolt Hole Gasket
“felpro gaskets are great”
Top-Quality National 1966 GMC I1000 Differentials
For those in search of a high-quality Differential for their 1966 GMC I1000, Advance Auto Parts offers a great selection of National Differentials. With 3 National Differentials in stock, you can trust you’re getting top-tier parts designed for durability and a perfect fit. Prices for these Differentials start at just $7.99, with an average price of $17.66, giving you a range of options to suit your budget. Backed by over 44 customer ratings and an average rating of 4.3 stars, National Differentials provide both reliability and excellent performance. Choosing a National Differential from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.
from
$7.99
(4)
Bearing Race
“Goes with M88010 bearing cup.
Application was the pinion bearing race for a Ford 9 Inch on a 1957 Ford F-100.”
FAQs for 1966 GMC I1000 Differentials
What are the best-selling Differentials for 1966 GMC I1000s?
Out of 9 Differentials that fit 1966 GMC I1000s, the following parts are the top sellers:
- Axle Housing Cover Gasket Irregular Shaped 12 Bolt Hole Gasket (5783836) – $9.49
- Multi-Purpose Bearing (3275884) – $27.99
- Bearing Race (5052416) – $10.79
What’s the price range for 1966 GMC I1000 Differentials?
The prices of Differentials for the 1966 GMC I1000 range from $7.99 up to $46.99 for the most premium parts.
What is the average price of a Differential for a 1966 GMC I1000?
The average price for Differentials for the 1966 GMC I1000 is $18.00. Keep in mind the variety of part types within our Differential category, where you are likely to find a wide range of prices across a variety of parts and components.
What are the cheapest Differentials for my 1966 GMC I1000?
The cheapest 1966 GMC I1000 Differentials we carry are:
- Bearing Race (3277585) – $7.99
- Differential Carrier Gasket Round Shaped 10 Bolt Hole Gasket (19780345) – $8.99
- Axle Housing Cover Gasket Irregular Shaped 12 Bolt Hole Gasket (5783836) – $9.49
- Oil Seal (5440122) – $9.79
- Bearing Race (5052416) – $10.79
Does Advance Auto Parts sell Differentials for any other 1966 GMC models?
Yes. We stock Differentials for 19 other popular 1966 GMC models. Some of the most popular are 1966 K15/K1500 Pickup Differentials, 1966 Suburban Differentials, 1966 G1000 Series Differentials, 1966 PB1000 Series Differentials, and 1966 I1500 Differentials.
What are the top-rated Differentials that fit the 1966 GMC I1000?
Based on 49 reviews by customers, our 1966 GMC I1000 Differentials have an average customer rating of 5 stars. These are the highest-rated categories of Differentials for the 1966 GMC I1000 and their top-rated products:
- Front Differential Pinion Bearings
- Bearing Race (3277585) – $7.99
- Tapered Roller Bearing Cone (5052424) – $22.99
- Differential Bearings
- Multi-Purpose Bearing (3275884) – $27.99
What types of Differentials do you sell for my 1966 GMC I1000?
As of 11/2/25, these are some of the most in-demand types of Differentials for a 1966 GMC I1000:
Can I get help with 1966 GMC I1000 Differential orders?
Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about GMC Differentials and more.
What is your return policy for GMC I1000 Differentials?
Advance Auto Parts keeps returns simple. For new GMC I1000 Differentials and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.