Looking for rearend parts....

Discussion in 'Got gears?' started by 3shields, Oct 8, 2023.

  1. 3shields

    3shields Let's go, MOUNTAINEERS!!!

    I need to change the seals, and service the rearend in my 70 GSX. I think someone told me there was a board member who knew where and how to get the correct parts, or maybe even had a supply.

    I assume I need both axle seals, a pinion seal, a crush sleeve and nut?

    Thanks in advance.
  2. Mark Demko

    Mark Demko Well-Known Member

    Monzaz or Brian Trick
  3. BrianTrick

    BrianTrick Brian Trick

    Everything is available except the crush sleeve,but that can be re-used. As far as bearings/seals go,nothing obsolete for the 1970 rear.
  4. 3shields

    3shields Let's go, MOUNTAINEERS!!!

    Thanks Guys!
  5. David Hemker

    David Hemker Well-Known Member

    There are 2 different axle seals used on the 70, 8.2 rear axles. One is .375 thick, the other is .490 thick. The parts books and computers do not reflect this. Make sure to measure your original seals before installing the seals and bearings. The thicker one is listed for the 71 and newer 8.5 axles.
    National 2146 is .375, National 712146 is .490.
    The bearing is the same National A-9.
    Bigpig455 likes this.
  6. BrianTrick

    BrianTrick Brian Trick

    Inner pinion bearing/race = M804049/M804010
    Outer pinion bearing/race = M86649/M86610
    Pinion seal = 8620,or some older numbers like 47392
    LH carrier bearing/race = SET36
    RH carrier bearing/race = LM501349/LM501314
    Axle bearing = SET9 or A9
    Axle seal = 712146

    Attached Files:

    SpecialWagon65 likes this.
  7. FJM568

    FJM568 Well-Known Member

    Nice info!

    Someone needs to post a sticky that lists part numbers of bearings/seals for the various Buick years/rearends, so that people won't have to search through old posts for it. And what's still available easily and what's harder to find.

    These posts keep popping up with the same questions.
  8. 3shields

    3shields Let's go, MOUNTAINEERS!!!

    I copied and pasted all this info to a file on my phone for future use.
  9. monzaz

    monzaz Jim

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