/ Register

Advise needed on broken posi

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

Page 3 of 6
  1. Apr 6, 2021 #21
    big gear head

    big gear head Veteran Member

    Messages:
    6,398
    Likes Received:
    172
    Joined:
    Jul 30, 2001
    Location:
    Central City, Ky.
    This is a simple tool I made many years ago. It's driven in many shims. DSC00809.JPG
     
    BC_Homegrown likes this.
  2. Apr 7, 2021 #22
    Rosster

    Rosster Veteran Member Gold Member

    Messages:
    437
    Likes Received:
    216
    Joined:
    Mar 1, 2020
    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?
     
    STUCKINCALI and carhead22000 like this.
  3. Apr 7, 2021 #23
    big gear head

    big gear head Veteran Member

    Messages:
    6,398
    Likes Received:
    172
    Joined:
    Jul 30, 2001
    Location:
    Central City, Ky.
    Because you don't screw around with worn gears. If you start changing things they are going to make noise.
     
    Fbird likes this.
  4. Apr 7, 2021 #24
    BC_Homegrown

    BC_Homegrown Member

    Messages:
    35
    Likes Received:
    6
    Joined:
    Sep 9, 2018
    Location:
    Powell River BC
    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. Apr 7, 2021 #25
    73Z L92

    73Z L92 Veteran Member

    Messages:
    149
    Likes Received:
    38
    Joined:
    Jan 25, 2011
    Location:
    Carlos, MN
    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. Apr 7, 2021 #26
    BC_Homegrown

    BC_Homegrown Member

    Messages:
    35
    Likes Received:
    6
    Joined:
    Sep 9, 2018
    Location:
    Powell River BC
    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. Apr 7, 2021 #27
    big gear head

    big gear head Veteran Member

    Messages:
    6,398
    Likes Received:
    172
    Joined:
    Jul 30, 2001
    Location:
    Central City, Ky.
    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. Apr 8, 2021 #28
    ChevyReb

    ChevyReb Veteran Member Lifetime Gold Member

    Messages:
    4,206
    Likes Received:
    155
    Joined:
    Feb 4, 2003
    Location:
    SC
    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.
     
    STUCKINCALI and big gear head like this.
  9. Apr 8, 2021 #29
    73Z L92

    73Z L92 Veteran Member

    Messages:
    149
    Likes Received:
    38
    Joined:
    Jan 25, 2011
    Location:
    Carlos, MN
    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. Apr 8, 2021 #30
    carhead22000

    carhead22000 oldblue

    Messages:
    397
    Likes Received:
    152
    Joined:
    Sep 5, 2011
    Location:
    canada
    interesting stuff....always learning,,you guys are great.
     
Page 3 of 6

Share This Page