1966 Mercury Comet Differentials

Name: Tapered Roller Bearing Cone
Brand: National
SKU: HM89443
Price: 38.99 USD
Rating: 5.0 (2 reviews)

Keep Your 1966 Mercury Comet in Top Shape with Quality Differentials

Whether you’re repairing or upgrading your Differential, using high-quality parts is key to keeping your 1966 Mercury Comet looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Differential Oil, Differential Bearings, and Differential Ring Gear Bolts. 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, Motive Gear, and FELPRO. For example, National Differentials start at just $7.99 with an average 4.3 star rating. Motive Gear and FELPRO offer similar pricing and quality, backed by strong customer feedback. With over 264 reviews and a solid 5 star average, you can shop with confidence knowing other Mercury Comet owners approve.

Competitive Prices and Extensive Inventory

The average price for a 1966 Mercury Comet Differential at Advance Auto Parts is around $263.79, with a range that starts at $1.99 and goes up to $1,211.99. With 384 options in stock from 12 trusted brands, finding the right fit is easy. Popular picks like Tapered Cone/Cup Wheel Bearing Set, Pinion Crush Sleeves, and Copper Washer For Ford 9" & 8" Dropout Housing start at just $5.99 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 1966 Mercury Comet in peak condition, inside and out.

Looking for the perfect Differential for your 1966 Mercury Comet? 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 Mercury Comet. Whether you’re driving a 1966 model or another popular model year like 1968, 1969, 1971, 1972, 1973, 1974, 1975, 1976, and 1977, 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 Mercury Comet Differentials

from

$38.99

Manufactured with premium-grade steel, National taper bearing cones feature crowned raceways and rollers to ensure even load distribution.

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

from

$941.99

The Yukon Grizzly Locker is the ultimate in locking differentials for street, off-road, & drag racing. Grizzly Lockers provide 100% power to both tires, while still allowing for disengagement while negotiating turns. The Yukon Grizzly locker is a mechanical locking differential. It features a forged case and 8620 internals for maximum strength. It’s patented design reduces common locker failures. All units assembled in the USA! All Grizzly Lockers are backed by the best warranty in the business! Yukon covers the replacement unit and covers any collaterally damaged parts and associated labor, up to $2,000!

Product Features:

Fits Ford 8″ with 31 spline axles
Patented internal design reduces common locker failures
8620 internals for added strength
Assembled in the USA

from

$11.99

8″ dropout housing gasket.

Product Features:

Dropout gasket
Fits Ford 8″

from

$175.99

Product Features:

Fits Ford 9″ with 28 spline pinion
Larger inner pinion bearing reduces gear deflection under high load
Nodular iron
Does not include races

from

$354.99

USA Standard ring & pinion sets are the right choice to add confidence to your install. USA Standard Gear offers a full line of ring & pinion sets for a variety of common & hard to find applications. USA standard gear offers a standard one year warranty against defects on their ring & pinion sets.

Product Features:

Fits Ford 9″
9.00″ ring gear diameter
28 spline pinion
10 ring gear bolts
5.13 ratio

from

$51.99

One (1) specialty bearing race to adapt small bearing journal into a 3.250″ dropout. This adapter allows the use of a 28 or 31 spline carrier, positraction or locker in a 3.250″ dropout. This is a perfect solution if you are currently running 28 or 31 spline axles but are looking to upgrade to 35 spline later, or are stepping down from 35 spline but don’t want to buy a new dropout.

Product Features:

Carrier race
Fits Ford 9″
Conversion race to install small bearing carrier into 3.250″ dropout

from

$339.99

9″ TracLoc case, bare, 28 & 31 spline, 2or4 PIN, 4 TAB clutches.

Product Features:

Trac Loc positraction carrier case
Does not include spider gears
Fits Ford 9″ with 28 or 31 spline axles

from

$4.99

Ford 8″ & 9″ TracLoc ring gear bolt, 1-1/4″ long.

Product Features:

Ring gear bolt for Ford 8″ and 9″
For use with Trac Loc limited slip
1.25″ long

from

$41.99

Product Features:

PREMIUM MATERIALS: Precision manufactured using premium-grade steel for outstanding durability and performance
STRONG AND DURABLE: Controlled heat treatment process for strength and durability
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

from

$301.99

Yukon standard open spider gear kit for 9″ Ford with 31 spline axles and 2-pinion design. Yukon uses higher quality materials and better techniques than OEM to ensure a longer lasting spider gear set. All components come with a one year warranty against manufacturing defects.

Product Features:

Spider gear kit
Fits Ford 9″ open differential with 31 spline axles
Includes two side gears, two pinion gears, cross pin shaft, roll pin and spider gear thrust washers.

from

$404.99

Yukon Performance steel spool for 9″ Ford with 35 spline axles. Spool uses 1.785″ journal bearings. fits 2.8″ and 3.0″ cases. Yukon performance spools are made from the highest quality materials to ensure high strength and long life in performance applications. Spools provide 100% power to both tires at all times and are a lower cost alternative to lockers. Spools are not recommended for street driven vehicles. Yukon Performance spools come with a one year warranty against manufacturing defects.

Product Features:

Fits Ford 9″ with 35 spline axles
Small bearing journal to fit 2.968″ and 3.062″ dropouts
Provides 100% traction to both wheels at all times
Not recommended for street driven vehicles

from

$4.99

Trac Loc clutch guide for 9″ Ford.

Product Features:

Clutch guide
Fits Ford 8″ and 9″

from

$4.99

Pinion gear thrust washer for 8″ and 9″ Ford, Model 20, and 7.25″ Chrysler.

Product Features:

Pinion gear thrust washer for Ford 8″, Ford 9″ and Chrysler 7.25″

from

$883.99

The Yukon carrier bearing Puller works with an impact gun to quickly and safely remove carrier bearings without damaging them. This unit comes with a handy bench top stand and works with up to one ton applications including Dana 70HD, Dana 80, 10.25″ & 10.5″ Ford, or GM & Chrysler 11.5″ differentials.

Product Features:

Carrier bearing puller
Works with an impact gun to safely and easliy remove carrrier bearings

from

$47.49

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.

from

$789.99

The Yukon Dura Grip provides aggressive yet smooth traction to give you the confidence & performance you need. Get longer life and better traction with the heavy duty Yukon Dura Grip Positraction. The Yukon-Trac Loc uses a nodular case, billet side hat, and forged internals for higher strength than stock Trac-Locs. The units use composite clutches for high performance and long life. All units are Rebuildable. Yukon offers a one year warranty against manufacturing defects.

Product Features:

Fits Ford 8″ with 31 spline axles
Trac Loc positraction
Clutch style positraction
Aggressive design
Internal gears are manufactured using forged 4320 steel and cut to provide stronger teeth
Fully rebuildable
Assembled in the USA

from

$9.99

8″ Ford O-ring.

Product Features:

Pinion support o-ring
Fits Ford 8″

from

$257.99

Yukon Bearing installation kits are perfect for shops & builders who have shims on the shelf and are looking to save cost over a Master Overhaul kit. This kit uses carrier bearings & races with an I.D. of 2.000″ and an O.D. of 3.250″. This kit uses Timken bearings and races along with all high quality small parts. kit includes carrier bearings and races, pinion bearings and races, pilot bearing, pinion seal, crush sleeve (if applicable), oil baffles and slingers (if applicable), marking compound and brush. Yukon does extensive research for each application to make sure your kit will arrive with all the correct parts you need to install your ring & pinion set.

Product Features:

Fits Ford 9″ with LM104911 carrier races
Included are carrier bearings and races, pinion bearings and races, pinion seal, crush sleeve, pilot bearing, marking compound and brush.

from

$55.99

7.25″ Ford & 6.75″ Ford pinion seal.Yukon Mighty seal.

Product Features:

Pinion seal
Fits Ford 6.75″ and 7.25″

from

$94.99

3.062″ side adjuster, Only Fits Yukon Ford 9″ Drop Out, new design ONLY.

Product Features:

Side adjuster
Fits Ford 9″
3.062″ designs only

from

$40.99

9.25 Chrysler FRONT PINION KIT , 03 & UP DODGE TRUCK .

Product Features:

Pilot bearing
Fits Ford 8″

from

$6.99

Pinion support bolt for 8″ and 9″ Ford.

Product Features:

Pinion support bolt for Ford 8″ and 9″
3/8″ x 24 thread
1.0″ long

from

$18.99

1310 and 1330 U/bolt kit (2 U-bolts and 4 nuts) for 9″ Ford.

Product Features:

u-joint u-bolt kit
Fits Ford 9″
1310 and 1330 u-joint size
Includes two u-bolts and four nuts

from

$4.99

STAR washers, 3.062″ Yukon Ford 9″ Drop Out new design ONLY.

Product Features:

Star washer
Fits Ford 9″
3.062″ designs only

from

$16.49

Manufactured with premium-grade steel, National taper bearing cups feature crowned raceways to ensure even load distribution.

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

from

$5.99

Product Features:

Side gear thrust washer for Ford 8″, Ford 9″ and AMC Model 20
0.030″ thick

from

$26.99

9″ Ford pinion nut, 35 spline Large pinion oversize.

Product Features:

Pinion nut
Fits Ford 9″ with 35 spline pinion

from

$21.99

Product Features:

Friction plate
Fits Ford 8″ and 9″ Trac Loc positraction

Popular 1966 Mercury Comet Differentials Categories

Differential Oil

Rear Differential Cover Gaskets

Differential Open Unit and Components

Differential Bearings

Differential Pinion Pilot Bearings

Differential Carriers

Differential Bearing Kits

Front Differential Pinion Bearings

Differential Spider Gear Kits

Differential Rebuild Kits

Differential Carrier Shim Kits

Differential Pinion Seals

Differential Clutch Packs

Differential Ring and Pinions

Differential Cases

Differential End Yokes

Differential Pinion Supports

Rear Differential Pinion Bearings

Differential Spools

Differential Lock Springs

Differential Carrier Bearing Adjusters

Differential Pinion Bearing Kits

Complete Differentials

Differential Ring Gear Bolts

Bearing Race Drivers

Differential Crush Sleeves

Differential Side Bearing Spacers

Differential Pinion Shims

Differential Pinion Shaft Nuts

Differential Gear Install Kits

Differential Cross Pins

Automatic Transmission Differential Carrier Gaskets

Differential Housing O-Rings

Differential Side Gear Thrust Washers

Differential Pilot Bearing

Differential Pinion Gear Thrust Washers

Differential Drive Pinion Gear Bearing Retainer Bolts

Differential Drive Pinion Oil Deflectors

Limited Slip Differential Assemblies

Differential Lock Washers

Differential Clutch Pack Clips

Differential Lock Thrust Blocks

Differential Pinion Bearing Spacers

Differential Bearing Adjuster Nut Lock Bolts

Differential Carrier Bearing Races

Best-Selling 1966 Mercury Comet Differential Bearings

Upgrade your Comet with one of our 10 best-selling Differential Bearings, earning an average 4.5 stars rating across 28 reviews.

show more show less

from

$26.99

Value-priced bearing meets all cataloged application requirements.

Product Features:

Brand may vary by location

from

$18.99

Product Features:

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

from

$4.49

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

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

from

$8.49

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

from

$11.99

Pilot bearing retainer for Ford 9″.

Product Features:

Pilot bearing retainer for Ford 9″

from

$13.99

8″ Ford pilot bearing retainer.

Product Features:

Pilot bearing retainer for Ford 8″

from

$28.49

With advanced load-carrying capacity and compact design, tapered roller bearings are used in wheel bearings, transmissions, differentials, transfer cases and other miscellanous applications. FAG manufacturers over 100 million tapered roller bearings annually.

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

from

$11.29

High-precision and High-quality components used in all KITs
Coverage of classic and new high-tech solutions for the best system coverage

from

$9.99

High-precision and High-quality components used in all KITs
Coverage of classic and new high-tech solutions for the best system coverage

from

$6.69

High-precision and High-quality components used in all KITs
Coverage of classic and new high-tech solutions for the best system coverage

Top-Quality Differential Ring Gear Bolts for 1966 Mercury Comets

Choose a high-quality OEM or aftermarket Differential Ring Gear Bolt for Mercury Comets and enjoy top-notch performance from $1.99.

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from

$5.99

Ford 8″ & 9″ standard Open, AG, & Detroit locker ring gear bolt. 7/16″ head, .925″ long.

Product Features:

Ring gear bolt for Ford 8″ and 9″
For use with standard open carrier, Auburn Gear limited slip and Detroit Locker
7/16″ head
.925″ long

from

$5.99

Ford 8″ & 9″ standard Open, AG, & Detroit locker ring gear bolt, 1.0″ long, Ford.

Product Features:

Ring gear bolt for Ford 8″ and 9″
For use with standard open carrier, Auburn Gear limited slip and Detroit Locker
1.0″ long

from

$4.99

Ford 8″ & 9″ TracLoc ring gear bolt, 1-1/4″ long.

Product Features:

Ring gear bolt for Ford 8″ and 9″
For use with Trac Loc limited slip
1.25″ long

from

$1.99

Product Features:

BOLT 9″ FORD OPEN R.G. SAME AS M-4216A200

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.

Product Features:

Forged From Premium Grade 8740 Chrome Moly Steel
Heat Treated
Nominally Rated At 200,000 PSI Tensile Strength
Specially Hardened, Precision Ground Washers
0.95″ Underhead Length
200,000 PSI
Sold As A Set

from

$3.99

Trac Loc ring gear bolt washer for 8″ and 9″ Ford.

Product Features:

Ring gear bolt for Ford 8″ and 9″
For Trac Loc positraction applications only

Top Picks for 1966 Mercury Comet Rear Differential Cover Gaskets

Invest in one of our 2 durable Rear Differential Cover Gaskets for your 1966 Mercury, knowing you’re getting trusted brands and expert craftsmanship.

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from

$11.99

9″ Ford gasket.

Product Features:

Dropout gasket
Fits Ford 9″

from

$11.99

8″ dropout housing gasket.

Product Features:

Dropout gasket
Fits Ford 8″

Top-Rated Differential Pinion Seals for 1966 Mercury Comets

Make a smart move for your 1966 Mercury Comet with products all priced from $6.49 to $55.99.

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from

$12.99

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:

Design type: spring loaded; multi-lip
Temperature range: -40 Deg. F to 225 Deg. F / -40 Deg. C to 107 Deg. C
Good low temperature capability
Low swell in hydrocarbon fluids
Delivers quality and reliable performance for every type of repair

from

$6.49

Value-priced seal meets all cataloged application requirements.

Product Features:

Brand may vary by location

from

$17.99

Pinion seal for ’61-’85 9″ Ford. 3″ OD.Yukon Mighty seal.

Product Features:

Pinion seal
Fits 1961-1985 Ford 9″
3.00″ O.D.

from

$55.99

7.25″ Ford & 6.75″ Ford pinion seal.Yukon Mighty seal.

Product Features:

Pinion seal
Fits Ford 6.75″ and 7.25″

from

$24.99

8″ Ford pinion seal.Yukon Mighty seal.

Product Features:

Pinion seal
Fits Ford 8″

from

$21.79

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.

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

from

$12.99

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!

from

$9.99

Top-Rated Differential Brands For Your 1966 Mercury Comet

When it comes to finding the perfect Differential for your 1966 Mercury Comet, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 12 trusted brands. We carry the most popular Differential brands including FELPRO, National, and Motive Gear, and more, all known for their exceptional customer ratings (average brand rating of 4.6 stars) and competitive prices, as low as $2.99. Purchasing a Differential from us here at Advance Auto Parts is a smart move for both you and your 1966 Mercury Comet, providing peace of mind with parts that meet or exceed OEM standards.

Popular FELPRO 1966 Mercury Comet Differentials

If you’re looking for a top-quality Differential for your 1966 Mercury Comet, 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 $9.99, you’ll find the perfect Differential for your needs and budget. FELPRO Differentials for the 1966 Mercury Comet come highly rated, with over 9 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 $9.99

(9)

Differential Carrier Gasket Oval Shaped 10 Bolt Hole Gasket

“Right fit the first time.”

Top-Quality National 1966 Mercury Comet Differentials

For those in search of a high-quality Differential for their 1966 Mercury Comet, 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 $19.99, giving you a range of options to suit your budget. Backed by over 8 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.”

from $12.99

(2)

Multi-Purpose Seal

“Worked great on this 1966 Mustang w/ 8″ rear end.”

from $38.99

(2)

Tapered Roller Bearing Cone

“nice finish and function. Should perform well.”

FAQs for 1966 Mercury Comet Differentials

What are the best-selling Differentials for 1966 Mercury Comets?

Out of 384 Differentials that fit 1966 Mercury Comets, the following parts are the top sellers:

Tapered Cone/Cup Wheel Bearing Set (5050723) – $26.99
Pinion Crush Sleeves (22140006) – $6.49
Copper Washer For Ford 9" & 8" Dropout Housing (11643432) – $5.99

What’s the price range for 1966 Mercury Comet Differentials?

The prices of Differentials for the 1966 Mercury Comet range from $1.99 up to $1,211.99 for the most premium parts.

What is the average price of a Differential for a 1966 Mercury Comet?

The average price for Differentials for the 1966 Mercury Comet is $263.79. 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 Comet model years?

Yes, we carry Differentials for 15 model years of Mercury Comets between 1960 and 1977. The following model years are the most popular for Differential purchases: 1977, 1976, 1975, 1974, 1973, 1972, 1971, 1969, and 1968.

What are the cheapest Differentials for my 1966 Mercury Comet?

The cheapest 1966 Mercury Comet Differentials we carry are:

Ring Gear Bolt (19640279) – $1.99
Differential Crush Sleeve (20520219) – $2.99
Crush Sleeve (10592883) – $2.99
Differential Crush Sleeve (10282338) – $2.99
Trac Loc Ring Gear Bolt Washer For 8" And 9" Ford (11643118) – $3.99

Does Advance Auto Parts sell Differentials for any other 1966 Mercury models?

Yes. We stock Differentials for 11 other popular 1966 Mercury models. Some of the most popular are 1966 Monterey Differentials, 1966 Marauder Differentials, 1966 Colony Park Differentials, 1966 Villager Differentials, and 1966 Capri Differentials.

What are the top-rated Differentials that fit the 1966 Mercury Comet?

The one 1966 Mercury Comet Differential we have in stock is the Ring Gear Bolt. It costs $1.99.

What types of Differentials do you sell for my 1966 Mercury Comet?

As of 11/2/25, these are some of the most in-demand types of Differentials for a 1966 Mercury Comet:

Can I get help with 1966 Mercury Comet 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 Comet Differentials?

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

1966 Mercury Comet Differentials

National – Tapered Roller Bearing Cone (Part No.HM89443)

Yukon Gear – Grizzly Locker For Ford 8" With 31 Spline Axles (Part No.28007)

Yukon Gear – 8" Dropout Housing Gasket (Part No.23010)

Yukon Gear – Ford 9" Nodular Daytona Style Pinion Support (Part No.32164)

USA Standard Gear – Ring & Pinion Gear Set For Ford 9" In A 5.13 Ratio (Part No.36145)

Yukon Gear – One (1) Specialty Bearing Race To Adapt Small Bearing Journal Into A 3.250" Dropout (Part No.32157)

Yukon Gear – Trac Loc Case For Ford 9" (Part No.20079)

Yukon Gear – Ford 8" & 9" Tracloc Ring Gear Bolt (Part No.33044)

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

Yukon Gear – Standard Open Spider Gear Kit For 9" Ford With 31 Spline Axles And 2-Pinion Design (Part No.16033)

Yukon Gear – Steel Spool For Ford 9" With 35 Spline Axles, Small Bearing (Part No.32098)

Yukon Gear – Trac Loc Clutch Guide For 9" Ford (Part No.33250)

Yukon Gear – Pinion Gear And Thrust Washer For 8" And 9" Ford, Model 20, And 7.25" Chrysler (Part No.33301)

Yukon Gear – The Carrier Bearing Puller (Part No.56072)

Motive Gear – Differential Lock Thrust Block (Part No.D3SZ4211A)

Yukon Gear – Trac-Loc For Ford 8" Wtih 31 Spline Axles – Aggressive Design (Part No.26003)

Yukon Gear – 8" Ford O-Ring (Part No.30027)

Yukon Gear – Bearing Install Kit For Ford 9" Differential, LM104911 Bearings (Part No.11046)

Yukon Gear – 7.25" Ford & 6.75" Ford Pinion Seal (Part No.30173)

Yukon Gear – 3.062" Side Adjuster For Ford 9" (Part No.32139)

Yukon Gear – Pilot Bearing For Ford 8" (Part No.18043)

Yukon Gear – Pinion Support Bolt For 8" And 9" Ford (Part No.33242)

Yukon Gear – 1310 And 1330 U/Bolt Kit (2 U-Bolts And 4 Nuts) For 9" Ford (Part No.41112)

Yukon Gear – Star Washers, 3.062" Ford 9" Drop Out New Design Only (Part No.32143)

National – Bearing Race (Part No.LM29710)

Yukon Gear – Dana 44, Ford 8" / 9", And Model 20 Side Gear Thrust Washer Replacement (Part No.33283)

Yukon Gear – 9" Ford Pinion Nut, 35 Spline Large Pinion Oversize (Part No.33161)

Yukon Gear – Trac Loc Friction Plate, 4 Tab (Part No.16177)

Yukon Gear – Redline Synthetic "Shock Proof" Oil With Positraction Additive – 4 Quarts (Part No.15005)

Yukon Gear – Redline Synthetic "Shock Proof" Oil – 3 Quarts (Part No.15000)

Yukon Gear – Redline Synthetic "Shock Proof" Oil – 4 Quarts (Part No.15004)

Driveworks – Tapered Cone/Cup Wheel Bearing Set (Part No.S-A-35)

National – Multi-Purpose Bearing (Part No.A-37)

National – Bearing Race (Part No.LM67010)

National – Bearing Race (Part No.LM501310)

Yukon Gear – Pilot Bearing Retainer For Ford 9" (Part No.33255)

Yukon Gear – 8" Ford Pilot Bearing Retainer (Part No.33254)

FAG US – Bearing – TRB (Tapered Roller Bearing) (Part No.KT37)

FAG US – Cup (Part No.M88010)

FAG US – Cup (Part No.LM501310)

FAG US – Cup (Part No.LM67010)

Yukon Gear – Ford 8" & 9" Standard Open, Ag, & Detroit Locker Ring Gear Bolt (Part No.33058)

Yukon Gear – Ford 8" & 9" Standard Open, Ag, & Detroit Locker Ring Gear Bolt (Part No.33043)

Yukon Gear – Ford 8" & 9" Tracloc Ring Gear Bolt (Part No.33044)

Motive Gear – Ring Gear Bolt (Part No.D8OZ4216B)

ARP Auto Racing – For Use With Ford 9" Using 5/8"Socket, 0.94"L Under Head, 7/16"-20, 12Point Head (Part No.250-3002)

Yukon Gear – Trac Loc Ring Gear Bolt Washer For 8" And 9" Ford (Part No.33245)

Yukon Gear – 9" Ford Gasket (Part No.23012)

Yukon Gear – 8" Dropout Housing Gasket (Part No.23010)

National – Multi-Purpose Seal (Part No.8181NA)

Driveworks – Oil Seal (Part No.S-7044NA)

Yukon Gear – Pinion Seal For ’61-’85 9" Ford (Part No.30137)

Yukon Gear – 7.25" Ford & 6.75" Ford Pinion Seal (Part No.30173)

Yukon Gear – 8" Ford Pinion Seal (Part No.30180)

FAG US – Shaft Seal (Part No.SS2934)

Motive Gear – Differential Pinion Seal (Part No.7044NA)

Motive Gear – Differential Pinion Seal (Part No.8181NA)