GM 10 BOLT gear pattern

Discussion in 'Transmission & Driveline Topics' started by D94, Feb 6, 2018.

  1. D94

    D94 New Member

    27
    1
    Feb 6, 2018
    IMG_2755.JPG IMG_2751.JPG Hello all.
    I am currently in the process of rebuilding my 10 Bolt 8.5 with Richmond 3.42 and Eaton Trutrac. I have never done this before so I was hoping to get some advice on my gear pattern. This is with a .035 pinion shim and .009 backlash. Any info would be great. Thx.
     
  2. camaro71/holland

    camaro71/holland Veteran Member

    904
    24
    Aug 27, 2003
    The Netherlands
    Drive side too deep, substract 0.05 and check again. Coast side looks almost good, hope it will still be good after the change. Not far away from your end goal.
     
  3. big gear head

    big gear head Veteran Member

    5,917
    23
    Jul 30, 2001
    Central City, Ky.
    Yeah, what he said. A little too deep.
     
  4. D94

    D94 New Member

    27
    1
    Feb 6, 2018
    Great thx. Gonna try .030 shim, this Richmond kit doesn’t give many choices. I ordered the Yukon kit just in case, should be here tomorrow. I’ll post pics later when I’m done.
     
  5. D94

    D94 New Member

    27
    1
    Feb 6, 2018
    IMG_2756.JPG IMG_2763.JPG IMG_2764.JPG IMG_2765.JPG Ok. So here's what I got with .030 shim. Got the backlash a little tighter at .008 I think ( still getting used to getting the dial indicator set right ) which is within spec from Richmond. Unfortunately like I said this kit is limited on shims so I have no in between. Hopefully the Yukon kit will give me more options. I think it may be a bit too high now?
     
  6. big gear head

    big gear head Veteran Member

    5,917
    23
    Jul 30, 2001
    Central City, Ky.
    That coast side looks great, but the drive side is still just a little deep. Try .028 for the pinion shim and see how that looks.
     
  7. D94

    D94 New Member

    27
    1
    Feb 6, 2018
    Ok thx. I'm waiting for the Yukon kit today, hopefully there is a.028 in there. I don't have it with this Richmond kit the jump is from .030 to .021. Maybe a .0295. Have you ever sanded down shims to get thickness? Would that work? They gave me 3 .030 shims. I could use one of those?
     
  8. big gear head

    big gear head Veteran Member

    5,917
    23
    Jul 30, 2001
    Central City, Ky.
    I've got enough pinion shims to stack up about 3 feet high, so I usually don't have a problem getting the right thickness. I know that some of those kits don't have a very good selection. I like the Yukon and USA Standard kits, but Tom's Differentials probably has the best kits.
     
  9. D94

    D94 New Member

    27
    1
    Feb 6, 2018
    IMG_2769.JPG IMG_2768.JPG Got the Yukon kit. This is .027 stacked a .017/.010. Backlash a little tighter I think around .007. Thoughts?
     
  10. camaro71/holland

    camaro71/holland Veteran Member

    904
    24
    Aug 27, 2003
    The Netherlands
    Still too deep. Your coast side is going too deep as wel now. Do you set pinion pre-load?
     

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