1966 GMC I2500 Differentials
Keep Your 1966 GMC I2500 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 I2500 looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Front Housing Cover Gaskets, Differential Pinion Seals, and Front Differential Pinion Bearings. 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.
Competitive Prices and Extensive Inventory
The average price for a 1966 GMC I2500 Differential at Advance Auto Parts is around $20.95, with a range that starts at $9.49 and goes up to $57.99. With 11 options in stock from 4 trusted brands, finding the right fit is easy. Popular picks like Multi-Purpose Seal, Multi-Purpose Bearing, and Tapered Roller Bearing Cone start at just $17.49 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 I2500 in peak condition, inside and out.
Find Your Specific 1966 GMC I2500 Differentials
Looking for the perfect Differential for your 1966 GMC I2500? 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 I2500. Whether you’re driving a 1966 model or another popular model year like
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 I2500 Differentials
National – Multi-Purpose Seal (Part No.9316)
from
$17.49
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.
Product Features:
See More
Product Features:
- Design type: spring loaded; multi-lip
- Temperature range: -20 Deg. F to 300 Deg. F / -29 Deg. C to 49 Deg. C
- Resistance to EP lubricants
- Low swell in hydrocarbon fluids
- Delivers quality and reliable performance for every type of repair
National – Bearing Race (Part No.HM88510)
from
$11.79
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
Driveworks – Tapered Roller Bearing (Part No.S-HM-803110)
National – Tapered Roller Bearing Cone (Part No.HM88542)
from
$23.49
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 – Tapered Roller Bearing Cone (Part No.HM803146)
from
$38.49
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 – Bearing Race (Part No.382S)
from
$17.79
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
National – Multi-Purpose Bearing (Part No.KD-11786-Y)
from
$57.99
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
Victor Reinz – Differential Cover Gasket (Part No.71-14868-00)
from
$9.99
With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.
Product Features:
See More
Product Features:
- Choosing Victor Reinz assures getting OE quality parts in gaskets sets that have the coverage, contents, packaging and electronic cataloging to best meet the needs of the aftermarket.
Felpro – Axle Housing Cover Gasket Irregular Shaped 10 Bolt Hole Gasket (Part No.RDS 6095-1)
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
National – Bearing Race (Part No.HM803110)
from
$20.49
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
Felpro – Differential Carrier Gasket Round Shaped 10 Bolt Hole Gasket (Part No.RDS 5090)
from
$9.99
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:
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 I2500 Differentials Categories
Most Popular Front Housing Cover Gasket for 1966 GMC I2500s
Enhance your 1966 GMC I2500 with this popular Front Housing Cover Gasket we have in stock, for $9.49.
Felpro – Axle Housing Cover Gasket Irregular Shaped 10 Bolt Hole Gasket (Part No.RDS 6095-1)
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
Best-Selling 1966 GMC I2500 Differential Pinion Seal
Upgrade your I2500 with our best-selling Differential Pinion Seal.
National – Multi-Purpose Seal (Part No.9316)
from
$17.49
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.
Product Features:
See More
Product Features:
- Design type: spring loaded; multi-lip
- Temperature range: -20 Deg. F to 300 Deg. F / -29 Deg. C to 49 Deg. C
- Resistance to EP lubricants
- Low swell in hydrocarbon fluids
- Delivers quality and reliable performance for every type of repair
Top-Quality Front Differential Pinion Bearings for 1966 GMC I2500s
Choose a high-quality OEM or aftermarket Front Differential Pinion Bearing for GMC I2500s and enjoy top-notch performance from $11.79.
National – Tapered Roller Bearing Cone (Part No.HM88542)
from
$23.49
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 – Tapered Roller Bearing Cone (Part No.HM803146)
from
$38.49
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 – Bearing Race (Part No.HM88510)
from
$11.79
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
Driveworks – Tapered Roller Bearing (Part No.S-HM-803110)
Top Picks for 1966 GMC I2500 Differential Bearings
Invest in one of our 2 durable Differential Bearings for your 1966 GMC, knowing you’re getting trusted brands and expert craftsmanship.
National – Multi-Purpose Bearing (Part No.KD-11786-Y)
from
$57.99
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
National – Bearing Race (Part No.382S)
from
$17.79
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
Our Rear Differential Cover Gaskets for 1966 GMC I2500s
Make a smart move for your 1966 GMC I2500 with our Rear Differential Cover Gasket for $9.99.
Victor Reinz – Differential Cover Gasket (Part No.71-14868-00)
from
$9.99
With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.
Product Features:
See More
Product Features:
- Choosing Victor Reinz assures getting OE quality parts in gaskets sets that have the coverage, contents, packaging and electronic cataloging to best meet the needs of the aftermarket.
FAQs for 1966 GMC I2500 Differentials
What are the best-selling Differentials for 1966 GMC I2500s?
Out of 11 Differentials that fit 1966 GMC I2500s, the following parts are the top sellers:
- Multi-Purpose Seal (18445057) – $17.49
- Multi-Purpose Bearing (3277216) – $57.99
- Tapered Roller Bearing Cone (3276961) – $23.49
What’s the price range for 1966 GMC I2500 Differentials?
The prices of Differentials for the 1966 GMC I2500 range from $9.49 up to $57.99 for the most premium parts.
What is the average price of a Differential for a 1966 GMC I2500?
The average price for Differentials for the 1966 GMC I2500 is $20.95. 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 I2500?
The cheapest 1966 GMC I2500 Differentials we carry are:
- Axle Housing Cover Gasket Irregular Shaped 10 Bolt Hole Gasket (5189276) – $9.49
- Differential Carrier Gasket Round Shaped 10 Bolt Hole Gasket (19780361) – $9.99
- Differential Cover Gasket (12547604) – $9.99
- Bearing Race (3276953) – $11.79
- Tapered Roller Bearing (10659680) – $13.49
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 types of Differentials do you sell for my 1966 GMC I2500?
As of 11/2/25, these are some of the most in-demand types of Differentials for a 1966 GMC I2500:
Can I get help with 1966 GMC I2500 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 I2500 Differentials?
Advance Auto Parts keeps returns simple. For new GMC I2500 Differentials and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.