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Motive Rear End Installation and Bearing Kit - 8.8 in. (86-14 V8; 11-14 V6)

Market Price $90.99 You Save 16% ($15.00)
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  • Item 21201
  • MPN# R8.8RMK

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Features, Video & Details

  • Use When Rebuilding / Modding 8.8" Rear End
  • Includes All Bearings and Seals
  • For Ford 8.8" Rear End
  • Insures Against Future Problems

Review & Installation Video

Review & Install Video

Stephanie with here with my breakdown of the Motive rear end installation and bearing kit for all Mustangs with 8.8 rears, or in other words, all '86 to '14 V8s and '11 to '14 V6s. Ford's 8.8 rears are as stout as can be, almost the 9 inch of our generation. But, any time you're pulling the rear apart, whether you're just changing your rear gears or doing some maintenance on a higher mileage vehicle, it makes sense to install new seals and bearings while the housing is apart. It's never a good idea to redo a rear end using original bearings and bolts. Before I get too far into laying this kit out for you guys, I want to take a closer look at the brand, Motive. Motive Gear has been offering some of the highest quality drivetrain components on the market today for quite some time. You can find their logo on many drag cars including a large handful of Mustangs that participate in any major racing series, including the NMRA, NMCA, and NHRA. This Motive rear end install and bearing kit includes all of your bearings, seals, shims, and bolts, even down to the gear marking compound and Loctite. If you didn't know already, starting in 2010 Ford changed the inner rear gear pinion bearing in the 8.8 rear. This means that all of you 2010 and up owners will need a new 8.8 pinion bearing for proper installation which can be selected from the drop down menu on the product page at Click below to head back to the site if you aren't already there to see what I'm talking about. Installing this kit requires a higher level of mechanical expertise or even the help of a professional. If you're not familiar with setting backlash and pinion depth then I would recommend having a professional install this kit. In fact, a lot of our customers are letting us know that they did just that. They purchased the kit and had a professional install it to make sure that the proper gear mesh pattern was established. If you are tackling this job yourself, you're probably looking at about four hours of install time which can be made easier with the use of a lift and all of the proper tools necessary. But, it can still be done with the use of a jack and some stands. If you guys have any questions about this kit or the install, you can always reach out to a Mustang expert at any time. If you're installing some new rear gears or freshening up your Mustang that has some good mileage on it, you definitely need to check out the Motive rear end install and bearing kit for your 8.8 equipped V8 or V6 Mustang available here at

Everything needed to rebuild 8.8" rear end. When you're installing new gears in your Mustangs rear differential, it just makes sense to install new seals and bearings while the housing is apart. This is particularly true if your pony has more than 60,000 miles on it. It insures against the need for another costly teardown and rebuild.

Attention 2010 and newer Mustang Owners. Starting in 2010 Ford changed the inner rear gear pinion bearing in all 8.8" equipped Mustangs. Because of this you will require a new 8.8" rear gear pinion bearing (Ford part# 9L3Z-4630-A) for proper installation, please see drop down option above.

Application. This Motive Bearing Kit is designed for use in Mustangs that have an 8.8" rear end differential.

Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Details

What's in the Box
Hardware included:
  • Front & Rear Pinion Bearing
  • Pinion Seal
  • Carrier Bearings
  • Carrier Shims
  • Differential Bearings
  • Crush Sleeve
  • Pinion Nut
  • Cover Gasket
  • Ring Gear Bolts
  • Brush
  • Gear Marking Compound
  • Loctite
Installation Info
Will it fit my Mustang?
  • Boss 302 - 12, 13
  • Foxbody - 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93
  • Mach 1 - 03, 04
  • V6 - 11, 12, 13, 14
  • Bullitt - 01, 08, 09
  • Cobra - 94, 95, 96, 97, 98, 99, 01, 03, 04
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
  • GT500 - 07, 08, 09, 10, 11, 12, 13, 14

Fits Mustangs equipped with a 8.8" rear end. Does not include all bearings required for IRS Cobras

People Who Bought This Item Also Bought

Most Helpful Reviews

Essential for a gear swap

I was kind of grumpy that I had to buy this installation kit, since Ford changed the rear ends in the 2010 models. But, my mechanic said the kit was nice and went in easily. The parts are running very ...

Read More
Helpful (1)

What a kit

I went from 327 to 373 gears, this kit had everything I needed. Another great product from AM.

Helpful (1)

Overall Rating 4.8 out of 5 stars
Read All 100+ Reviews

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5 Questions / 10 Answers

Ask a Question

Do you know if these kits will fit a 99 f150 4x4 with an 8.8 rear gear?


Helpful (1)
  • The Motive Rear End Installation and Bearing Kit will work with pre 2015 8.8 rear axles.

    Rob D

Whats the difference? What is the difference between this kit and the kit for 35 dollars?


Helpful (1)
  • This kit comes complete with everything you need for a full rebuild: bearings, shims, crush sleeve, etc... The $35 kit is a basic kit that is the same as the more expensive version, but there are no bearings included. We highly recommend getting the complete kit and replacing all your bearings and shims at the same time to prevent any costly problems down the road. It's better to replace them all at once, rather than having to tear the car apart again just for a bearing gone bad.


Show 2 more answers

I am replacing the entire axle housing on my 14' GT. It appears this kit has everything I need for the housing swap. The original housing has damage. I need to confirm if this kit does actually have all the parts needed for the swap. (Besides gear oil) Thank you I already purchased new axles from you guys.


Helpful (0)
  • The Motive Rear End Installation and Bearing Kit - 8.8 in. (86-14 V8; 11-14 V6) comes with everything you need to replace your rear end. The only other part you'll need, since you have a 2014 Mustang GT, is going to be a Ford Rear Gear Pinion Bearing - 8.8in (10-14 V8; 11-14 V6), item # 52994, ( In 2010, Ford changed the rear inner gear pinion bearing.


What type of bearing come in this kit? Koyo or Timken?


Helpful (0)
  • This Motive Rear End Installation and Bearing Kit - 8.8 in. (86-14 V8; 11-14 V6) kit is going to have Timken pinion bearings and Koyo carriers.


4.10 gears installation kit I recently purchased the 4.10 gears for my 2006 mustang GT and I'm not sure which installation kit I should buy !! Is this the right one !?!


Helpful (0)
  • Certainly is the correct kit! It will come with everything you need for a complete swap during your 4.10 gear install! Includes all the bearings, shims and seals necessary!


Show 3 more answers

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Customer Reviews (100+) Write a Review

Overall Rating 4.8

out of 5 stars

  • 5/5

    November 24, 2013

    Excellent product

    I used this kit when doing a gear swap, no issues at all everything is of great quality in the kit.


    Year: 2007 Submodel: GT Indiana, USA

    Helpful (2)

  • 5/5

    September 19, 2013

    Everything you need to get the job done

    A very needed item if your changing gears, if your changing gears order this at the same time.


    Year: 1999 Submodel: GT Woodruff, WI, USA

    Helpful (2)

  • 5/5

    August 01, 2013

    Install kit

    Got this when I was getting my 4.10s installed. Has everything you need for a gear swap and my mechanic said everything went together smoothly. Highly recommended when you change your gears.


    Year: 2005 Submodel: GT NJ

    Helpful (2)

  • 5/5

    March 27, 2012

    Essential for a gear swap

    I was kind of grumpy that I had to buy this installation kit, since Ford changed the rear ends in the 2010 models. But, my mechanic said the kit was nice and went in easily. The parts are running very smoothly so far, and I don't hear any "gear noise" that I've read about in reviews of the 3.73 and 4.10 gears. If you own a 2010 or later GT, you'll need this kit to upgrade to a higher gear. I think it was really worth it, and the new gears in my Mustang have really improved the overall performance of the car.


    Year: 2010 Submodel: GT Alexandria, VA

    Helpful (1)

  • 5/5

    September 23, 2011

    What a kit

    I went from 327 to 373 gears, this kit had everything I needed. Another great product from AM.


    Year: 1997 Submodel: GT Glade Spring, Va

    Helpful (1)

  • 5/5

    August 04, 2011

    One Item Missing

    As stated before, this is a great kit, but my installer says it should come with the axle shaft seals, which he had to go out and get the day of the installation of the new 4.10 gears.

    Derek H. from Kelowna

    Year: 2001 Submodel: Cobra

    Helpful (1)

  • 5/5

    September 26, 2010

    Master Install Kit

    An absolute must have for gear installs. Made the whole process much simpler and hassle-free. And with a price like this, it can't be beat.


    Helpful (2)

  • 5/5

    July 25, 2010

    motive bearing kit

    Great kit needed when installing gears!!!


    Helpful (2)

  • 5/5

    July 14, 2010

    Bearing kit

    Good kit - no shims for the pinion in the kit

    Jerry Goodman

    Helpful (2)

  • 5/5

    May 21, 2010


    Everything i needed to change my gear on my Mustang GT 95 was in the kit and at a very good price


    Year: 1995 Submodel: GT

    Helpful (2)

  • 5/5

    December 28, 2010

    good deal and quality

    very good buy and quality .


    Helpful (3)

  • 5/5

    January 09, 2010

    Pay for it now

    Even if you send the car to the shop to get it rebuild, you are much better off buying this kit then paying for parts. I was quoted a $900 installation + parts for redoing my rear gears. So I purchased the parts and lube here in American Muscle and only paid for labor which was only $360, so I ended up saving $275.

    R. Hidalgo

    Year: 1990

    Helpful (19)

  • 5/5

    June 18, 2010

    Must Have

    bought these along with 3.73 gears for my 06 GT, if your installing new gears you NEEEEDD this kit. NEVER redo a rear end reusing the original bearings and bolts.I had ford do the install and if i bought the same bearings and bolts through them it woulda been $250 extra. trust me these are so worth it and assurance that NOTHING can go wrong if you do the install correctly


    Year: 2006 Submodel: GT

    Helpful (10)

  • 5/5

    September 09, 2009

    did what it was supposed to...

    well, its a bearing kit- no frills to it i guess. I wish there had been a larger selection of new shims to use- there seemed to be only 2 sizes if i remember correctly, so you have to use a larger stack of shims, as opposed to a few thicker shims... not that it really makes a diference i guess. it also comes with a kick a$$ motive bearing sticker for your tool box... oh, and the directions for how to re seal the cover were wrong... My instructions are to take that gasket in your hand, and sling it into the front yard as hard as you can- then go get some good rtv and put a bead on the case... those gaskets are worthless...


    Helpful (9)

  • 5/5

    July 17, 2009

    Worked well

    I took this and my FRPP gears to my installer and he had everything he needed with this kit.


    Helpful (7)

  • 5/5

    October 14, 2010

    Rear End Installation Kit (8.8in)

    Kit was complete and installation was normal. Addition of timkins products would enhance it's sale.

    Leonard Kolpak

    Helpful (4)

  • 5/5

    October 29, 2009

    Made life easy.

    You absolulty need this kit if you are doing gears.

    Charles Zimmerman

    Helpful (8)

  • 5/5

    December 17, 2009

    motive bearing kit

    have used this kit many times for gear installs. makes the job easy and uses quality parts. will buy again for the next gear swap!

    terry stokes

    Helpful (7)

  • 5/5

    December 29, 2013

    Motive Rear End Installation and Bearing Kit - 8.8in (86-14 V8

    This kit had everything I needed to change my gears. It made it quick and easy to do. I would recommend this kit when changing out your rear end gears.


    Year: 2014 Submodel: GT Lathrop, CA, USA

    Helpful (2)

  • 5/5

    May 15, 2013

    Rear End Kit

    Great product...great value. Just what I needed to button up my rebuilt 8.8.


    Year: 1988 Submodel: GT

    Helpful (2)

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