Advise needed on broken posi

Discussion in 'Transmission & Driveline Topics' started by BC_Homegrown, Apr 4, 2021.

  1. big gear head

    big gear head Veteran Member

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    This is a simple tool I made many years ago. It's driven in many shims. DSC00809.JPG
     
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  2. Rosster

    Rosster Veteran Member Gold Member

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    Rather than rely on old, worn diff backlash, why not set everything to factory specs? If it was worn with excessive backlash why would you want to mimic that?
     
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  3. big gear head

    big gear head Veteran Member

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    Because you don't screw around with worn gears. If you start changing things they are going to make noise.
     
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  4. BC_Homegrown

    BC_Homegrown Member

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    I was wondering the same, and that makes total sense.

    Once I get the dial gauge if the backlash is way out, or the pattern shows alot of wear or if there is damage I haven't been able to see I will just have to bite the bullet and replace the ring and pinion.

    Even if I have to pay someone else to do that I'm still no further behind than I am now and I'm learning a huge amount so I don't mind.
     
  5. 73Z L92

    73Z L92 Veteran Member

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    So I just got back my 80 8.5" from the guy I've used many times to rebuild my rear ends. I also used a Tru Trac with 30 splines. Yes I had to buy new axles from Moser. The owner of the shop that did the work me always likes to use shims to dial in the pinion pre-load in lieu of a crush sleeve. His opinion is that if you are putting some serious hp to the ground the sleeve could move around increasing clearance.
    My .02 on the gears is just get new ones. I like Motive Gear.
     
  6. BC_Homegrown

    BC_Homegrown Member

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    Thanks 73z I didn't know shims were an option instead of a crush sleeve, interesting.

    My OCD says replace everything but the ring and pinion will be the difference between me doing the work or the shop so I'm treating that as a last resort.

    I looked into upgrading to 30 spline but figured the stock axles should be ok to get me going and I can always change them for aftermarket 28's later. I'm not pushing loads of power and don't plan on putting slicks on, will hopefully hold up ok for the occasional smoke show:cool:
     
  7. big gear head

    big gear head Veteran Member

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    Your axles are probably worn from many years of use and need to be replaced anyway. 30 spline axles are just a little more than stock replacements and much stronger.
     
  8. ChevyReb

    ChevyReb Veteran Member Lifetime Gold Member

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    Good for you going for it and doing the work yourself man.

    When the guy setup my rear he took it back apart and machined a solid sleeve the same length as the crush sleeve so it cannot change.

    He is a professional welder and welded my axle tubes to the pumpkin with the correct nichol content rods and preheated it all to correct temp before welding and after that wrapped center in heat shield blankets so it cooled down slowly.
     
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  9. 73Z L92

    73Z L92 Veteran Member

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    I too had my axle tubes welded with nickel rod and cooled down as said above. I also had them weld over the plug welds to prevent gear oil leakage.
     
  10. carhead22000

    carhead22000 oldblue

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    interesting stuff....always learning,,you guys are great.
     

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