1978 Mercury Cougar Performance Drivetrains
Keep Your 1978 Mercury Cougar in Top Shape with Quality Performance Drivetrains
Whether you’re repairing or upgrading your Performance Drivetrain, using high-quality parts is key to keeping your 1978 Mercury Cougar looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Performance Ring and Pinions and Performance Posi Units and Components. 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 1978 Mercury Cougar Performance Drivetrain at Advance Auto Parts is around $294.37, with a range that starts at $31.99 and goes up to $577.99. With 21 options in stock from 2 trusted brands, finding the right fit is easy. Popular picks like Differential Mini Spool, Differential Ring And Pinion, and RngPnn start at just $31.99 and offer a great balance of form and function.
Explore Related Parts
While you’re upgrading or replacing your Performance Drivetrain, don’t forget to check out other key components like Performance Distributors and Performance Fuel Systems. At Advance Auto Parts, we’re here to help you keep your 1978 Mercury Cougar in peak condition, inside and out.
Find Your Specific 1978 Mercury Cougar Performance Drivetrains
Looking for the perfect Performance Drivetrain for your 1978 Mercury Cougar? You’re in the right place. Below, you’ll find links to various types of Performance Drivetrains that fit your vehicle. At Advance Auto Parts, we offer only the highest quality OEM and aftermarket Performance Drivetrains, ensuring durability and a precise fit for your Mercury Cougar. Whether you’re driving a 1978 model or another popular model year like
1989,
1990,
1991,
1992,
1993,
1994,
1995,
1996, and
1997, we’ve got you covered. Purchasing Performance Drivetrains 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 Performance Drivetrains that fit your vehicle.
Essential 1978 Mercury Cougar Performance Drivetrains
Motive Gear – Differential Mini Spool (Part No.MS9-31)
Richmond Gear – MiniSpool (Part No.78-8831-1)
from
$151.99
MiniSpool
Motive Gear – Differential Mini Spool (Part No.MS88-31)
Powertrax – Lock Right Locker (Part No.1820-LR)
from
$442.99
The Powertrax Lock-Right ultra-strength alloy locker’s straight-line performance is equal to a solid spool, but automatically unlocks in turns. Best suited for extreme off-road to severe on-road use, Powertrax Lock Right lockers replace the spider gears in your open differential carrier using basic tools and without affecting your ring and pinion settings. The whole job can be done in your driveway in a couple of hours, pin included! Powertrax Grip-Lok, Lock-Right Lockers and No-Slip Traction Systems automatically provide 100% traction on-demand, under the toughest circumstances. The Powertrax Grip-Pro and Grip-LS performance limited slips offer smooth dependable torque transfer and traction for the best of both worlds!The Powertrax® Lock-Right Locker provides outstanding traction for off-road machines and race vehicles. Powertrax No-Slip Traction Systems deliver excellent performance to street-driven cars and trucks.Powertrax® lockers range from the original, Lock-Right for serious straight-line performance, to the No-Slip traction system for street-able vehicles. Powertrax® offers three levels of GRIP locking differentials, ranging from the clutch-type GRIP LS with a forged steel case, the gear-driven GRIP PRO and finally the GRIP LOK for extreme traction. Powertrax® = Extreme Traction Systems!
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Motive Gear – Performance Differential Ring and Pinion (Part No.F880325)
Motive Gear – Performance Differential Ring and Pinion (Part No.F875456)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890300)
Richmond Gear – RngPnn (Part No.69-0179-1)
from
$344.99
RngPnn
Motive Gear – Performance Differential Ring and Pinion (Part No.F890375)
Richmond Gear – Differential Ring And Pinion (Part No.69-0069-1)
from
$360.99
Richmond Gear is the leading manufacturer of professional quality, high-performance drivetrain products. Our complete line of products ranges from high performance ring-and-pinion sets for serious street and racing applications to torque-hungry manual transmissions and components. Richmond Gear products have been winners both at the Daytona 500 and U.S. Nationals for decades. WINNERS RUN RICHMOND!
Product Features:
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Product Features:
- For over 80-years, the Richmond Double-Diamond logo has represented some of the highest quality gears in the racing industry. Winners Run Richmond!
- The superior quality of Richmond gearsets is a result of outstanding design, world class manufacturing and an extensive testing process that is performed on all products.
- Richmond performance gearsets have been winners for decades at: NHRA, NMRA, NMCA, Daytona 500, WISSOTA and U.S. Nationals.
- Richmond Gear is a leading manufacturer of high performance ring and pinion gearsets and drivetrain components, backed by a two year warranty.
- Engineered to perform faster and be more reliable, Richmond performance drivetrain products are the result of a continuous research and development program combined with state-of-the-art manufacturing capabilities.
Richmond Gear – RngPnn (Part No.F9433)
from
$185.99
RngPnn
Richmond Gear – RngPnn (Part No.69-0067-1)
from
$360.99
RngPnn
Motive Gear – Performance Differential Ring and Pinion (Part No.F890543)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890457)
Motive Gear – Performance Differential Ring and Pinion (Part No.F888390)
Motive Gear – Performance Differential Ring and Pinion (Part No.F888430)
Richmond Gear – RngPnn (Part No.F9567)
from
$185.99
RngPnn
Richmond Gear – RngPnn (Part No.69-0376-1)
from
$359.99
RngPnn
Richmond Gear – RngPnn (Part No.F9650)
from
$185.99
RngPnn
Richmond Gear – RngPnn (Part No.F9633)
from
$185.99
RngPnn
Motive Gear – Performance Differential Ring and Pinion (Part No.F890650)
Richmond Gear – Differential Ring And Pinion (Part No.49-0111-1)
from
$333.99
Richmond Gear is the leading manufacturer of professional quality, high-performance drivetrain products. Our complete line of products ranges from high performance ring-and-pinion sets for serious street and racing applications to torque-hungry manual transmissions and components. Richmond Gear products have been winners both at the Daytona 500 and U.S. Nationals for decades. WINNERS RUN RICHMOND!
Product Features:
See More
Product Features:
- For over 80-years, the Richmond Double-Diamond logo has represented some of the highest quality gears in the racing industry. Winners Run Richmond!
- The superior quality of Richmond gearsets is a result of outstanding design, world class manufacturing and an extensive testing process that is performed on all products.
- Richmond performance gearsets have been winners for decades at: NHRA, NMRA, NMCA, Daytona 500, WISSOTA and U.S. Nationals.
- Richmond Gear is a leading manufacturer of high performance ring and pinion gearsets and drivetrain components, backed by a two year warranty.
- Engineered to perform faster and be more reliable, Richmond performance drivetrain products are the result of a continuous research and development program combined with state-of-the-art manufacturing capabilities.
Motive Gear – PRO Gear Lightweight Differential Ring And Pinion – Small Pinion (Part No.F990543SP)
Richmond Gear – RngPnn (Part No.69-0361-1)
from
$342.99
RngPnn
Richmond Gear – RngPnn (Part No.69-0312-1)
from
$350.99
RngPnn
Richmond Gear – Differential Ring And Pinion (Part No.49-0027-1)
from
$344.99
Richmond Gear is the leading manufacturer of professional quality, high-performance drivetrain products. Our complete line of products ranges from high performance ring-and-pinion sets for serious street and racing applications to torque-hungry manual transmissions and components. Richmond Gear products have been winners both at the Daytona 500 and U.S. Nationals for decades. WINNERS RUN RICHMOND!
Product Features:
See More
Product Features:
- For over 80-years, the Richmond Double-Diamond logo has represented some of the highest quality gears in the racing industry. Winners Run Richmond!
- The superior quality of Richmond gearsets is a result of outstanding design, world class manufacturing and an extensive testing process that is performed on all products.
- Richmond performance gearsets have been winners for decades at: NHRA, NMRA, NMCA, Daytona 500, WISSOTA and U.S. Nationals.
- Richmond Gear is a leading manufacturer of high performance ring and pinion gearsets and drivetrain components, backed by a two year warranty.
- Engineered to perform faster and be more reliable, Richmond performance drivetrain products are the result of a continuous research and development program combined with state-of-the-art manufacturing capabilities.
Richmond Gear – RngPnn (Part No.69-0382-1)
from
$369.99
RngPnn
Richmond Gear – RngPnn (Part No.49-0101-1)
from
$333.99
RngPnn
Popular 1978 Mercury Cougar Performance Drivetrains Categories
Most Popular Performance Ring and Pinions for 1978 Mercury Cougars
Enhance your 1978 Mercury Cougar with one of the 20 Performance Ring and Pinions we have in stock, starting at just $216.99.
Richmond Gear – Differential Ring And Pinion (Part No.49-0027-1)
from
$344.99
Richmond Gear is the leading manufacturer of professional quality, high-performance drivetrain products. Our complete line of products ranges from high performance ring-and-pinion sets for serious street and racing applications to torque-hungry manual transmissions and components. Richmond Gear products have been winners both at the Daytona 500 and U.S. Nationals for decades. WINNERS RUN RICHMOND!
Product Features:
See More
Product Features:
- For over 80-years, the Richmond Double-Diamond logo has represented some of the highest quality gears in the racing industry. Winners Run Richmond!
- The superior quality of Richmond gearsets is a result of outstanding design, world class manufacturing and an extensive testing process that is performed on all products.
- Richmond performance gearsets have been winners for decades at: NHRA, NMRA, NMCA, Daytona 500, WISSOTA and U.S. Nationals.
- Richmond Gear is a leading manufacturer of high performance ring and pinion gearsets and drivetrain components, backed by a two year warranty.
- Engineered to perform faster and be more reliable, Richmond performance drivetrain products are the result of a continuous research and development program combined with state-of-the-art manufacturing capabilities.
Richmond Gear – RngPnn (Part No.69-0369-1)
from
$577.99
RngPnn
Motive Gear – PRO Gear Lightweight Differential Ring And Pinion – Small Pinion (Part No.F990543SP)
Richmond Gear – RngPnn (Part No.69-0288-1)
from
$379.99
RngPnn
Richmond Gear – Differential Ring And Pinion (Part No.69-0069-1)
from
$360.99
Richmond Gear is the leading manufacturer of professional quality, high-performance drivetrain products. Our complete line of products ranges from high performance ring-and-pinion sets for serious street and racing applications to torque-hungry manual transmissions and components. Richmond Gear products have been winners both at the Daytona 500 and U.S. Nationals for decades. WINNERS RUN RICHMOND!
Product Features:
See More
Product Features:
- For over 80-years, the Richmond Double-Diamond logo has represented some of the highest quality gears in the racing industry. Winners Run Richmond!
- The superior quality of Richmond gearsets is a result of outstanding design, world class manufacturing and an extensive testing process that is performed on all products.
- Richmond performance gearsets have been winners for decades at: NHRA, NMRA, NMCA, Daytona 500, WISSOTA and U.S. Nationals.
- Richmond Gear is a leading manufacturer of high performance ring and pinion gearsets and drivetrain components, backed by a two year warranty.
- Engineered to perform faster and be more reliable, Richmond performance drivetrain products are the result of a continuous research and development program combined with state-of-the-art manufacturing capabilities.
Richmond Gear – RngPnn (Part No.69-0067-1)
from
$360.99
RngPnn
Richmond Gear – RngPnn (Part No.69-0179-1)
from
$344.99
RngPnn
Richmond Gear – RngPnn (Part No.69-0361-1)
from
$342.99
RngPnn
Motive Gear – Performance Differential Ring and Pinion (Part No.F890375)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890300)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890325)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890370)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890430)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890600)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890650)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890529)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890583)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890543)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890457)
Motive Gear – Performance Differential Ring and Pinion (Part No.F890350)
Best-Selling 1978 Mercury Cougar Performance Posi Units and Component
Upgrade your Cougar with our best-selling Performance Posi Units and Component.
Motive Gear – Differential Mini Spool (Part No.MS9-31)
FAQs for 1978 Mercury Cougar Performance Drivetrains
What are the best-selling Performance Drivetrains for 1978 Mercury Cougars?
Out of 21 Performance Drivetrains that fit 1978 Mercury Cougars, the following parts are the top sellers:
- Differential Mini Spool (19640012) – $31.99
- Differential Ring And Pinion (10584211) – $360.99
- RngPnn (10586154) – $342.99
What’s the price range for 1978 Mercury Cougar Performance Drivetrains?
The prices of Performance Drivetrains for the 1978 Mercury Cougar range from $31.99 up to $577.99 for the most premium parts.
What is the average price of a Performance Drivetrain for a 1978 Mercury Cougar?
The average price for Performance Drivetrains for the 1978 Mercury Cougar is $294.37. Keep in mind the variety of part types within our Performance Drivetrain category, where you are likely to find a wide range of prices across a variety of parts and components.
Does Advance Auto Parts sell Performance Drivetrains for other Mercury Cougar model years?
What are the cheapest Performance Drivetrains for my 1978 Mercury Cougar?
The cheapest 1978 Mercury Cougar Performance Drivetrains we carry are:
- Differential Mini Spool (19640012) – $31.99
- Performance Differential Ring and Pinion (20640491) – $216.99
- Performance Differential Ring and Pinion (20640492) – $221.99
- Performance Differential Ring and Pinion (20640514) – $225.99
- Performance Differential Ring and Pinion (20640416) – $241.99
Does Advance Auto Parts sell Performance Drivetrains for any other 1978 Mercury models?
Yes. We stock Performance Drivetrains for 4 other popular 1978 Mercury models. Some of the most popular are 1978 Grand Marquis Performance Drivetrains, 1978 Zephyr Performance Drivetrains, 1978 Marquis Performance Drivetrains, 1978 Monarch Performance Drivetrains, and 1978 Bobcat Performance Drivetrains.
What are the top-rated Performance Drivetrains that fit the 1978 Mercury Cougar?
The one 1978 Mercury Cougar Performance Drivetrain we have in stock is the Differential Mini Spool. It costs $31.99.
What types of Performance Drivetrains do you sell for my 1978 Mercury Cougar?
As of 3/1/26, these are some of the most in-demand types of Performance Drivetrains for a 1978 Mercury Cougar:
Can I get help with 1978 Mercury Cougar Performance Drivetrain orders?
Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Mercury Performance Drivetrains and more.
What is your return policy for Mercury Cougar Performance Drivetrains?
Advance Auto Parts keeps returns simple. For new Mercury Cougar Performance Drivetrains and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.