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Rear Diff Mystery

Discussion in '"Stock" Alpine' started by mxp01, Sep 6, 2020.

  1. mxp01

    mxp01 Gold Level Sponsor

    I am having trouble diagnosing a problem. last week pulling into traffic (kind of heavy on the throttle at take off) in 1st gear a noise came from what sounded like the rear end. The noise sounded like gears jumping teeth if that makes any sense. The car felt like the clutch slipped. Once moving no problem, the car went up hills fine under load and changed gears fine. Got to another intersection and made a right turn very slowly in 1st gear and this time the noise again, and engine revs like the clutch is slipping and the car accelerated very slowly. I pulled over and tried to go in reverse, now the car will not move. 1st, 2nd, 3rd nothing. I put the car is 1st and look under at the drive shaft and its spinning. So I catch a ride home to get my truck and trailer to bring the car home.

    Now I have the whole rear end assembly removed from the car. Axles look good, cannot see any visible damage to any of the gears or bearings in the diff. No metal shavings in the housing assembly. everything spins freely, spin one wheel forward the other spins backwards, spin the yoke and the wheels spin. I kind of understand how these things work but I am far from a expert at them. I'm stumped on this issue. Could I possibly be over looking something in the diff?

    Thanks
    Cade
     
  2. DanR

    DanR Diamond Level Sponsor

    If you are running wire wheels it could be the splines!

    If you are running 4 bolt wheel/mags, etc I would suggest the axle key has been stripped....
     
  3. Gordon Holsinger

    Gordon Holsinger Diamond Level Sponsor

    Do you have wire wheels? If so it is stripped splines. Check RR in particular power is on RR!
     
  4. mxp01

    mxp01 Gold Level Sponsor

    4 bolt wheels
     
  5. mxp01

    mxp01 Gold Level Sponsor

    I think you all are correct. I can hold one axle and spin the hub. Do I need any special tools to pull the hub from the axle?
     
  6. DanR

    DanR Diamond Level Sponsor

    A wheel/hub puller that you can fasten the 4 lug bolts and used for the puller
     
  7. jumpinjan

    jumpinjan Donation Time

    Huh? Didn't you say the rear axle gears LOOK fine? That tells me somehow you disassembled it without pulling the hubs off FIRST.
    One should always pull the hubs off first with a proper puller...it's so much easier
    Jan
     
  8. mxp01

    mxp01 Gold Level Sponsor

    I took the 5 nuts and bolts off the flange and slid the axle out. see attached photo.

    I guess I made more work for myself.
     

    Attached Files:

  9. DanR

    DanR Diamond Level Sponsor

    The yellow marking are for depiction of the axle key that is suspect in your case.

    Alpine rear axles showing the wheel keys          _LI.jpg Alpine rear axles showing the wheel keys          _LI.jpg
     
  10. mxp01

    mxp01 Gold Level Sponsor

    Alright I’ll pull the hubs tomorrow and see what I find. Thank you all for the input.
     
  11. DanR

    DanR Diamond Level Sponsor

    Cade, Remove the axle nut, then the washer!

    Replace the nut, just make sure that you leave some space between the nut and the hub.

    DO NOT LEAVE THE AXLE NUT OFF !!

    The hub will actually have a tremendous force when it is finally broken loose from the axle.
     
  12. DanR

    DanR Diamond Level Sponsor

    I'd pull the Right Rear first! That is the drive wheel and most likely the culprit
     
  13. RootesRacer

    RootesRacer Donation Time

    The spider pinion shaft transfers the differential torque to the axles. If the spider gears/pinions or the pinion shaft breaks then there will be no power sent to the axles. If its not sheared keyes from above, its probably gonna be the spiders or the spider shaft.
     
  14. jumpinjan

    jumpinjan Donation Time

    Yep, I understand what you did, the problem is how to secure the removed axle shaft, while you bang on the puller dog with a 4lb hammer?
    If you left the whole rear axle assembly in the car first, the car will support everything and you can go at the hammering way more easily.
    The workshop manual is there to help.
    Jan
     
  15. mxp01

    mxp01 Gold Level Sponsor

    Here is what I found.
     

    Attached Files:

  16. DanR

    DanR Diamond Level Sponsor

    As I suspected, the axle key stripped.
     
  17. volvoguys

    volvoguys Diamond Level Sponsor

    Your axle/hub mating surfaces are very scored. Plan on replacing your axle, as well.
     
  18. bernd_st

    bernd_st Bronze Level Sponsor

    Can you post a close up of the splined end of your axle shaft ? Perhaps I'm wrong but on the first photo it looks as if some splines are gone...
     
  19. mxp01

    mxp01 Gold Level Sponsor

     

    Attached Files:

  20. bernd_st

    bernd_st Bronze Level Sponsor

    Thanks. Splined end looks a bit worn but still ok. Stripped axle key was the culprit...
     
    Last edited: Sep 7, 2020

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