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GM 12 Bolt 8.875 Rear Differential Car And Truck

12 bolt car used from 1965-1972
12 bolt truck used from 1964-1982
See differential ID for proper identifaction

Note:car and truck are very different and will not interchange
"Please Note This When Ordering Parts"

Jump To Another G.M.Differential

Note: Some parts not listed, see illistration and call for availibility

diff breakdown



28 Installation Kit


axle shaft axle c-clip wheel stud axle seal axle bearing pinion nut pinion yoke washer pinion yoke yoke flinger pinion seal outter pinion bearing/race vent fill plug crush sleeve inner pinion bearing /race pinion shim pinion ring gear carrier side shim lock screw cross shaft cover gasket diff cover cover bolt ring gear bolt carrier side shim carrier side bearing diff carrier carrier side bearing inner diff kit

  1. Axleshaft axleshaft.jpg


    Axles for 12 bolt CAR will most likley need to be custom made call for instructions.
    Click for application list for 12 bolt TRUCK
    NOTE: if your axle is not listed call us we can get most axles made to order.Most of our axles do not come with studs so if you need them don't forget to ask. What about the axle bearing and seal?

    12 bolt axles come in 30 splines
    Measuremets are from face of flange to end

  2. C-Clip

    In most cases if you need one you either lost it or you had a bad axle failure

  3. Wheel Stud

    Sometimes we can help, length and thread is needed we can't always go by application

  4. Axle Seal

    If your seal is leaking don't forget to check your axle for damage.

    Application is needed their are a few choices and an axle code will help off the paper tag on axle tube


    5. Axle bearing and seal  

    NOTE:Axle bearings and seals are not included in installation kit


  5. Axle Bearing

    If you have bad axle bearing also check your axle it could be bad also. Remember to get the axle seal you will have to remove it to replace the bearing.

  6. Pinion Nut

    A new nut is always a good choice to maintain proper torque and the also comes in the instalation kit.

  7. Yoke Washer

    The washer is very important when trying to achieve and maintain nut torque.

  8. Pinion Yoke Yokes on you

    Often the pinion yoke my have to be replaced for various reasons and proper identification is necessary by application or by dimensional measurements. A new seal and crush sleeve is always recomended when changing the yoke.

  9. Yoke Flinger

    Somtimes we can you help on these please call for availability.

  10. Pinion Seal Pinion Yoke nut and seal

    Got to keep the oil in, this seal is also included in the     instalation kit a new crush sleeve and nut is also recomended.

  11. Outter Pinion Bearing/Race

    This bearing is included in the     installation kit

  12. Vent

    If you need one let us know if it is press in or threaded. Make sure your vent is not plugged if the differential can not breathe the oil will be fourced out through the seals.If oil is comming out of the vent chances the vehicle is upside down or the unit has been overfilled.

  13. Fill Plug

    Did you strip out the plug? You can't get oil in if you can't get it out or did you loose it? Got to have one in or oil will come out! Let us know if you need one.

  14. Crush Sleeve

    This is also included in the     installation kit and a very important part when installing a ring and pinion to maintain proper pinion bearing pre-load. It is also good to install a new one when ever you remove the pinion nut.

  15. Inner Pinion Bearing/Race

    This bearing and race is included in the     installation kit

  16. Pinion Shim

    pinion depth shims are required when installing a new ring and pinion to achieve the proper tooth contact pattern.

  17. Ring And Pinion Sets

     ringpinion.jpg
    Click     here for available ratios for CAR
    Click here for available ratios for TRUCK
    Need to know how to figure gear ratio click here

  18. Lock Screw

    It is common for these lock screws to break when removing the cross shaft to to remove the axles.

  19. Carrier Shims

    Shims are required when installing a ring and pinion to set correct backlash.The shims we carry a called Super Shims click     here to find out why thay are so super.

  20. Carrier Side Bearing


    These bearings and races are included in the bearing installation     installation kit

  21. Differential Carrier

    opencasebare.jpg Open Bare case

    3.23 and up or 3.08 and down

    auburn.jpg auburnimg.jpg  
    Limited Slip for CAR
    Limited Slip for TRUCK
    We have had very good luck with these units.

  22. Ring Gear Bolt

    Always good to install news ones when changing ring an pinion sets

    Sold in sets of 10

  23. Cross Shaft

    If you see the shaft scored be shure to check the inner dif pinion gears the shaft goes through thay could be worn or damaged. Also check the case bore it also could be damaged, how about the lock screw?

  24. Cover Gasket

    Nothing better than a gasket to seal the cover. This is also included in the     installation kit

  25. Differiental Cover

    Some times the cover can get damaged or even rust out. We even have shiny chrome for you.

  26. Cover Bolt

    Most of these are a standard bolt and can be found at most auto part and hardware stores. Be sure to use a washer on the bolt if the replacement bolt does not incorperate one.

  27. Inner Differential Kit

    diffkit.jpg
    When these gears get damaged it often goes through everything be sure to check all of the rest of the parts for damage and get out all of the old chunks.

    Includes side gears,spider gears,washers,cross shaft and lock screw

  28. Installation Kit

    diffbrgkit.jpg


    What better than a kit to aid in your ring and pinion install or simple rebuild .......    info

K&L Unlimited 800-662-9103
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