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Motive Rear End Installation and Bearing Kit - 8.8 in. (11-14 V6; 86-14 V8, Excluding 13-14 GT500)

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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: 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
    • Bullitt - 01, 08, 09
    • Cobra - 93, 94, 95, 96, 97, 98, 99, 00, 01, 03, 04
    • Cobra R - 93, 95, 00
    • GT - 87, 88, 89, 90, 91, 92, 93, 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
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 86
    • V6 - 11, 12, 13, 14

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

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    9 Questions / 8 Answers

    Ask a Question

    I have read the contents of this kit, I have watched the video, but I STILL DON'T KNOW if this kit includes the rear gear pinion bearing kit necessary for 2010 Mustang gear swaps? And this is from a person who reads, writes and interprets complex written language for a living... Also, can not find this "drop-down" menu you are talking about in the video. You warn about it being necessary all the time, yet do not state clearly if this bearing kit contains it or not. Please indicate this CLEARLY for everyone to see, it is really confusing. Apart from that (assuming the kit DOES NOT include the rear, which I seem to deduct from one of the answers for previous questions), why make a bearing kit without the most important and needed bearing? Does ANY kit you sell include this 2010 rear gear pinion bearing (maybe those big kits with bottles for 279$ or any other kits by Ford?) or the only way is to buy the bearing separately?


    • We do apologize that the listing is not clear enough. The Motive Rear End Installation and Bearing Kit does not include the Rear Gear Pinion Bearing for 2010-2014 Mustangs. The bearing is not included in the kit because the kit is designed for 1986-2014 Mustangs, and it is not necessary for the majority of the years this kit works on. It is included in the Gear Combo Kits for the 2010-2014 GT and 2011-2014 V6 Mustangs found here:


    Helpful (1)

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


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

      Rob D

    Helpful (1)

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


    • 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 Helpful (1)

    I plan on adding the 2012 Boss 302 Torsen differential to my 2011 Mustang GT. Is this the proper kit I will need to freshen up rear end when I have the Torsen installed? The stock rear end has about 41k on it and 3.73 gears. And will the kit's cover plate seal work with the aluminum differential cover plate?


    • This Motive Rear End Installation and Bearing Kit does indeed come with everything needed to install new gears into a new differential.


    Helpful (0)

    Will this work on a 99 cobra?


    • The Motive Rear End Installation and Bearing Kit does not come with all of the required bearings for the Cobras IRS. This kit will not wok.

      AM MikeW

    Helpful (0)

    Hello, I have just received my item today (in France). I have seen on motivegear website that this kit (R8.8RMK) does not fit 2013 mustang GT. Can you confirm that?


    • This rear end install and bearing kit will work on a 2013 GT model Mustang.


    Helpful (0)

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    Customer Reviews (100+) Write a Review

    Overall Rating 4.8

    out of 5 stars

    • 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 (21)

    • 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 (12)

    • 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 (12)

    • 5/5

      October 29, 2009

      Made life easy.

      You absolulty need this kit if you are doing gears.

      Charles Zimmerman

      Helpful (11)

    • 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 (9)

    • 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 (8)

    • 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 (4)

    • 5/5

      December 28, 2010

      good deal and quality

      very good buy and quality .


      Helpful (4)

    • 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

      July 14, 2010

      Bearing kit

      Good kit - no shims for the pinion in the kit

      Jerry Goodman

      Helpful (4)

    • 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 (3)

    • 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 (3)

    • 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 (3)

    • 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 (3)

    • 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

      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)

    • 5/5

      July 25, 2010

      motive bearing kit

      Great kit needed when installing gears!!!


      Helpful (2)

    • 3/5

      July 14, 2010


      390 gear was professionally installed, better acceleration now with higher rpms, gear does whine though, would recommend getting ford racing (FR doesnt make the 390 tho and thats what i wanted so i chose motive)


      Year: 1990

      Helpful (2)

    • 5/5

      September 20, 2009


      these are just bearings and other odds and ends. you need them for piece of mind.


      Helpful (2)

    • 5/5

      September 06, 2008

      Great Kit

      Definitely a must do with any gear install.


      Helpful (2)

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