1984 Mercury Marquis Differentials

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Keep Your 1984 Mercury Marquis in Top Shape with Quality Differentials

Whether you’re repairing or upgrading your Differential, using high-quality parts is key to keeping your 1984 Mercury Marquis looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Differential Pinion Seals, Rear Housing Cover Gaskets, and Differential Axle Shafts. 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 Motive Gear, Powertrax, and Felpro. For example, Motive Gear Differentials start at just $6.99 with an average 4.1 star rating. Powertrax and Felpro offer similar pricing and quality, backed by strong customer feedback. With over 1,050 reviews and a solid 4.3 star average, you can shop with confidence knowing other Mercury Marquis owners approve.

Competitive Prices and Extensive Inventory

The average price for a 1984 Mercury Marquis Differential at Advance Auto Parts is around $147.91, with a range that starts at $1.29 and goes up to $1,115.99. With 47 options in stock from 13 trusted brands, finding the right fit is easy. Popular picks like Dorman – Help Differential Shaft Lock Bolt, 81048, Yukon Gear 3 Qt – Penzoil 80W90 Conventional Gear Oil, 15002, and Dorman – Help Pinion Crush Sleeves, 81056 start at just $6.79 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 Universal Joints. At Advance Auto Parts, we’re here to help you keep your 1984 Mercury Marquis in peak condition, inside and out.

Essential 1984 Mercury Marquis Differentials

Motive Gear – Motive Gear Performance Differential Ring and Pinion, F890716AX (Part No.F890716AX)

Motive Gear Performance Differential Ring and Pinion, F890716AX

from

$339.99
Motive Gear Performance Differential Ring and Pinion, F890716AX.
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Felpro – Felpro Axle Housing Cover Gasket Oval Shaped 10 Bolt Hole Gasket, RDS 55393 (Part No.RDS 55393)

Felpro Axle Housing Cover Gasket Oval Shaped 10 Bolt Hole Gasket, RDS 55393

from

$7.49
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.
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Motive Gear – Motive Gear Differential Crush Sleeve, B7A4662A (Part No.B7A4662A)

Motive Gear Differential Crush Sleeve, B7A4662A

from

$3.99
All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of our products undergo rigid quality control processes to insure proper fit, performance and longevity. Motive Gear products can be found in the winners circle at NHRA, IHRA, NMRA, NMCA, SODA, SCORE, BITD, Ultra-4 and NASCAR events because we offer unmatched selection and quality demanded by racers and their crew chiefs – the same quality and selection demanded by DIY customers and top mechanics. With four warehouses strategically located across North America, most Motive Gear orders arrive within 2-4 days. Win with Motive Gear.
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Dorman – Dorman Differential Clutch Kit, 697-780 (Part No.697-780)

Dorman Differential Clutch Kit, 697-780

from

$262.99
This differential disc kit is a low-cost, time-saving repair solution for the posi-traction function. They are designed to match the fit and performance of the original disc on specific vehicle years, makes and models.
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Driveworks – Driveworks Taper Bearing Cup, S-LM-501314 (Part No.S-LM-501314)

Driveworks Taper Bearing Cup, S-LM-501314

from

$7.99
Value-priced bearing meets all cataloged application requirements.
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Motive Gear – Motive Gear Differential Pinion Shim Kit, 1100 (Part No.1100)

Motive Gear Differential Pinion Shim Kit, 1100

from

$6.99
High-quality Differential Component Shim
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Powertrax – Powertrax Differential Lock Assembly, 1830-LR (Part No.1830-LR)

Powertrax Differential Lock Assembly, 1830-LR

from

$444.99
For vehicles that are driven daily, the Power Trax No-Slip Traction System is the latest design in quiet traction-adding differential technology. It combines the automatic street-friendly smooth operation of a limited-slip differential with the traction performance of a locking differential. The Power Trax No-Slip locker easily installs in to your differential carrier using basic tools and without affecting your ring and pinion settings. Power Trax Grip-Lok, Lock-Right Lockers and No-Slip Traction Systems automatically provide 100% traction on-demand, under the toughest circumstances. The Power Trax Grip-Pro and Grip-LS performance limited slips offer smooth dependable torque transfer and traction for the best of both worlds.
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Pro-King – Pro-King Differential Internal Nest Kit, 762B717 (Part No.762B717)

Pro-King Differential Internal Nest Kit, 762B717

from

$239.99
Pro-King is the leading supplier of transmission and driveline products in the aftermarket.
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Dorman – Help – Dorman – Help Differential Shaft Lock Bolt, 81048 (Part No.81048)

Dorman - Help Differential Shaft Lock Bolt, 81048

from

$6.79
This differential pinion shaft lock bolt 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.
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Yukon Gear – Yukon Gear 3 Qt – Penzoil 80W90 Conventional Gear Oil, 15002 (Part No.15002)

Yukon Gear 3 Qt - Penzoil 80W90 Conventional Gear Oil, 15002

from

$44.99
Union 76 gear oil is a conventional non-synthetic 80W90 formulation designed for all types of differentials.
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Dorman – Dorman Rear Axle Shaft, Left Or Right, 630-209A (Part No.630-209A)

Dorman Rear Axle Shaft, Left Or Right, 630-209A

from

$110.99
This axle shaft is designed to match the performance of the original equipment shaft on specified vehicle makes, models and years. When a factory axle shaft fails or is damaged by rust or collision, this replacement is engineered to help restore and ensure the proper transfer of torque and rotational power from the differential or transmission to the wheel.
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ARP Auto Racing – "ARP Auto Racing For Use With Ford 9"" Using 5/8""Socket, 0.94""L Under Head, 7/16""-20, 12Point Head, 250-3002" (Part No.250-3002)

"ARP Auto Racing For Use With Ford 9"" Using 5/8""Socket, 0.94""L Under Head, 7/16""-20, 12Point Head, 250-3002"

from

$43.99
The tremendous shock loads generated at launch by most any drag racing vehicle equipped with today sticky tire compounds or the acceleration and deceleration of oval track cars put considerable strain on the ring gear. For this reason, the fastener experts at ARP have developed the Pro Series ring gear bolts. they are forged from premium grade 8740 chrome moly steel and are heat treated to a nominal rating of 200,000 PSI tensile strength. Specially hardened, precision ground washers are included where required. Available to fit most any ring gear setup ranging from popular 9 Inch Ford GM 10 and 12 bolt rear ends to the beefy strange differentials found in top fuel and funny car applications.
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Sealed Power – Sealed Power Engine Auxiliary Shaft Bearing Set, 1460M (Part No.1460M)

Sealed Power Engine Auxiliary Shaft Bearing Set, 1460M

from

$23.99
Sealed Power parts provide innovative designs, use leading-edge materials and utilize ISO & QS certified manufacturing in order to deliver top quality products that meet the rigorous demands of today’s modern engines.
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National – National Axle Differential Bearing & Seal Kit, RA-311MK (Part No.RA-311MK)

National Axle Differential Bearing & Seal Kit, RA-311MK

from

$119.99
The National bearing & seal kit includes all the components required to complete the repair.
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Motive Gear – Motive Gear Master Bearing Kit, R9R306SMK (Part No.R9R306SMK)

Motive Gear Master Bearing Kit, R9R306SMK

from

$131.99
Motive Gear Differential Bearing Kits Include Front & Rear Pinion Bearing, Pinion Seal, Carrier Bearings, Pilot Bearing Where Applicable, Gear Marking Compound, Crush Sleeve, Pinion Nut, Brush, Thread Locking Compound And Cover Gasket Or Rtv
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Richmond Gear – Richmond Gear Differential Gear Install Kit, 83-1011-B (Part No.83-1011-B)

Richmond Gear Differential Gear Install Kit, 83-1011-B

from

$48.99
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.
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Motive Gear – Motive Gear Ring And Pinion Installation Kit, F9IKN (Part No.F9IKN)

Motive Gear Ring And Pinion Installation Kit, F9IKN

from

$46.49
All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of our products undergo rigid quality control processes to insure proper fit, performance and longevity. Motive Gear products can be found in the winners circle at NHRA, IHRA, NMRA, NMCA, SODA, SCORE, BITD, Ultra-4 and NASCAR events because we offer unmatched selection and quality demanded by racers and their crew chiefs – the same quality and selection demanded by DIY customers and top mechanics. With four warehouses strategically located across North America, most Motive Gear orders arrive within 2-4 days. Win with Motive Gear!
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National – National Shaft Repair Sleeve, 99166 (Part No.99166)

National Shaft Repair Sleeve, 99166

from

$36.49
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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National – National Multi-Purpose Bearing, R-1535-TAV (Part No.R-1535-TAV)

National Multi-Purpose Bearing, R-1535-TAV

from

$42.49
Manufactured with premium-grade steel, National cylindrical outer races are designed and engineered to meet OE specifications.
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Schaeffler – Schaeffler Shaft Seal, SS2934 (Part No.SS2934)

Schaeffler Shaft Seal, SS2934

from

$13.99
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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Schaeffler – Schaeffler Shaft Seal, SS2865 (Part No.SS2865)

Schaeffler Shaft Seal, SS2865

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.
See More

Motive Gear – Motive Gear Differential Pinion Nut, 379570S (Part No.379570S)

Motive Gear Differential Pinion Nut, 379570S

from

$6.99
All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of our products undergo rigid quality control processes to insure proper fit, performance and longevity. Motive Gear products can be found in the winners circle at NHRA, IHRA, NMRA, NMCA, SODA, SCORE, BITD, Ultra-4 and NASCAR events because we offer unmatched selection and quality demanded by racers and their crew chiefs – the same quality and selection demanded by DIY customers and top mechanics. With four warehouses strategically located across North America, most Motive Gear orders arrive within 2-4 days. Win with Motive Gear.
See More

Richmond Gear – Richmond Gear Differential Mini Spool, 78-8831-1 (Part No.78-8831-1)

Richmond Gear Differential Mini Spool, 78-8831-1

from

$151.99
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.
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Motive Gear – Motive Gear Differential Mini Spool, MS88-28 (Part No.MS88-28)

Motive Gear Differential Mini Spool, MS88-28

from

$98.99
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 Internal Carrier Gear Kit, F7.5BI (Part No.F7.5BI)

Motive Gear Differential Internal Carrier Gear Kit, F7.5BI

from

$149.99
Motive Gear Differential Internal Carrier Gear Kit, F7.5BI.
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Powertrax – Powertrax Grip LS Traction System, LS109031 (Part No.LS109031)

Powertrax Grip LS Traction System, LS109031

from

$451.99
For vehicles that are driven daily, the Powertrax No-Slip Traction System is the latest design in quiet traction-adding differential technology. It combines the automatic street-friendly smooth operation of a limited-slip differential with the traction performance of a locking differential. The Powertrax No-Slip locker easily installs in to your differential carrier using basic tools and without affecting your ring and pinion settings. 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!
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Most Popular Differential Pinion Seal for 1984 Mercury Marquis

Enhance your 1984 Mercury Marquis with this popular Differential Pinion Seal we have in stock, for $11.99.

Schaeffler – Schaeffler Shaft Seal, SS2865 (Part No.SS2865)

Schaeffler Shaft Seal, SS2865

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.
See More

Best-Selling 1984 Mercury Marquis Rear Housing Cover Gasket

Upgrade your Marquis with our best-selling Rear Housing Cover Gasket with a 4.5 Starts rating across 121 reviews.

Felpro – Felpro Axle Housing Cover Gasket Rectangular Shaped, 10 Bolt Hole Gasket, RDS 55341 (Part No.RDS 55341)

Felpro Axle Housing Cover Gasket Rectangular Shaped, 10 Bolt Hole Gasket, RDS 55341

from

$16.99
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.
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Top-Quality Differential Axle Shafts for 1984 Mercury Marquis

Choose a high-quality OEM or aftermarket Differential Axle Shaft for Mercury Marquis and enjoy top-notch performance from $117.99.

Dorman – Dorman Rear Axle Shaft, Left Or Right, 630-228A (Part No.630-228A)

Dorman Rear Axle Shaft, Left Or Right, 630-228A

from

$117.99
This axle shaft is designed to match the performance of the original equipment shaft on specified vehicle makes, models and years. When a factory axle shaft fails or is damaged by rust or collision, this replacement is engineered to help restore and ensure the proper transfer of torque and rotational power from the differential or transmission to the wheel.
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Top Picks for 1984 Mercury Marquis Differential Ring Gear Bolts

Invest in one of our 2 durable Differential Ring Gear Bolts for your 1984 Mercury, knowing you’re getting trusted brands and expert craftsmanship.

Motive Gear – Motive Gear Ring Gear Bolt, D5AZ4216A (Part No.D5AZ4216A)

Motive Gear Ring Gear Bolt, D5AZ4216A

from

$1.99
Motive Gear Ring Gear Bolt, D5AZ4216A.
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Pro-King – Pro-King Differential Ring Gear Bolt, 761A935 (Part No.761A935)

Pro-King Differential Ring Gear Bolt, 761A935

from

$1.29
Pro-King is the leading supplier of transmission and driveline products in the aftermarket.
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Differential Oil for 1984 Mercury Marquis

Make a smart move for your 1984 Mercury Marquis with products all priced from $35.99 to $44.99.

Yukon Gear – Yukon Gear 3 Qt – Penzoil 80W90 Conventional Gear Oil, 15002 (Part No.15002)

Yukon Gear 3 Qt - Penzoil 80W90 Conventional Gear Oil, 15002

from

$44.99
Union 76 gear oil is a conventional non-synthetic 80W90 formulation designed for all types of differentials.
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Valvoline – Valvoline Multi-Vehicle (ATF) Full Synthetic Automatic Transmission Fluid 1 GA, 904891 (Part No.904891)

Valvoline Multi-Vehicle (ATF) Full Synthetic Automatic Transmission Fluid 1 GA, 904891

from

$35.99
Choosing an automatic transmission fluid just got easier. Valvoline Full Synthetic MaxLife Multi-Vehicle ATF, the #1 ATF product, is suitable for use in 95% of ATF vehicles in operation with US registered light duty applications. And now, it€™s also recommended for most belt and chain-driven continuously variable transmissions (CVT). Featuring advanced additives to prevent the major causes of transmission breakdown, it€™s designed to help prevent leaks, reduce wear and tear, and maximize performance €“ all for much longer than conventional fluids. It has improved thermal stability for longer fluid life, better viscosity stability for consistent transmission operation, and frictional enhancements for smooth gear engagements. Whether your vehicle has a CVT or traditional automatic, Valvoline MaxLife Multi-Vehicle ATF is suitable for a broad range of transmissions including Ford, GM, Toyota, Honda, Nissan, Hyundai, Subaru, BMW, Mercedes, Volvo, VW and Audi vehicles. It€™s specifically recommended for use in the following applications: GM DEXRON-II, DEXRON-III, DEXRON-VI, and DEX-CVT; Ford MERCON LV; Toyota/Lexus Type T, T-II, T-IV, WS, CVTF FE, and CVTF TC. For the many miles ahead, trust your transmission with Valvoline, the #1 automatic transmission fluid brand.
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Top-Rated Differential Brands For Your 1984 Mercury Marquis

When it comes to finding the perfect Differential for your 1984 Mercury Marquis, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 13 trusted brands. We carry the most popular Differential brands including Powertrax, Felpro, and Motive Gear, and more, all known for their exceptional customer ratings (average brand rating of 5.0 stars) and competitive prices, as low as $6.99. Purchasing a Differential from us here at Advance Auto Parts is a smart move for both you and your 1984 Mercury Marquis, providing peace of mind with parts that meet or exceed OEM standards.

Popular Powertrax 1984 Mercury Marquis Differentials

If you’re looking for a top-quality Differential for your 1984 Mercury Marquis, Advance Auto Parts has exactly what you need with our selection of Powertrax Differentials. We have 1 Powertrax Differentials in stock for this fitment, all known for their durability and precision fit. With prices starting at just $444.99, you’ll find the perfect Differential for your needs and budget. Powertrax Differentials for the 1984 Mercury Marquis come highly rated, with over 1 customer reviews and an impressive average rating of 5.0 stars. Choosing a Powertrax Differential from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
Powertrax Differential Lock Assembly, 1830-LR
from $444.99
(1)
Powertrax Differential Lock Assembly, 1830-LR
“Fast service and the right part.”

Top-Quality Felpro 1984 Mercury Marquis Differentials

For those in search of a high-quality Differential for their 1984 Mercury Marquis, Advance Auto Parts offers a great selection of Felpro Differentials. With 1 Felpro 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 $16.99, giving you a range of options to suit your budget. Backed by over 121 customer ratings and an average rating of 4.6 stars, Felpro Differentials provide both reliability and excellent performance. Choosing a Felpro Differential from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.

FAQs for 1984 Mercury Marquis Differentials

What are the best-selling Differentials for 1984 Mercury Marquis?

Out of 47 Differentials that fit 1984 Mercury Marquis, the following parts are the top sellers:

What’s the price range for 1984 Mercury Marquis Differentials?

The prices of Differentials for the 1984 Mercury Marquis range from $1.29 up to $1,115.99 for the most premium parts.

What is the average price of a Differential for a 1984 Mercury Marquis?

The average price for Differentials for the 1984 Mercury Marquis is $147.91. 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.

Does Advance Auto Parts sell Differentials for other Mercury Marquis model years?

Yes, we carry Differentials for 18 model years of Mercury Marquis between 1967 and 1986. The following model years are the most popular for Differential purchases: 1986, 1985, 1983, 1982, 1981, 1980, 1979, 1978, and 1977.

What are the cheapest Differentials for my 1984 Mercury Marquis?

The cheapest 1984 Mercury Marquis Differentials we carry are:

Does Advance Auto Parts sell Differentials for any other 1984 Mercury models?

Yes. We stock Differentials for 4 other popular 1984 Mercury models. Some of the most popular are 1984 Cougar Differentials, 1984 Grand Marquis Differentials, 1984 Capri Differentials, 1984 Topaz Differentials, and 1984 Lynx Differentials.

What are the top-rated Differentials that fit the 1984 Mercury Marquis?

Based on 1,050 reviews by customers, our 1984 Mercury Marquis Differentials have an average customer rating of 4.3 stars. These are the highest-rated categories of Differentials for the 1984 Mercury Marquis and their top-rated products:

What types of Differentials do you sell for my 1984 Mercury Marquis?

As of 8/2/26, these are some of the most in-demand types of Differentials for a 1984 Mercury Marquis:

Can I get help with 1984 Mercury Marquis Differential orders?

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

What is your return policy for Mercury Marquis Differentials?

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