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Discussion Starter · #1 · (Edited)
10 Bolt 8.5" for a G-Body.
I do have the T&D Machine pinion depth tool and the Ratech pinion tool.
Both showed I needed a .011 pinion shim.
Tried the .011 shim and get a heel and toe contact.
Each time with a .009 back lash.
Measured multiple times.
Have never had an issue like this before.

Installed the original shim from the old factory gear .036.
Backlash is at .009

This is a new setup
Eaton Trutrac
3.55 US Gear
Timken bearings.

What do you all think of the pattern?
Any idea why I would get the .011 from the T&D, and get a bad pattern but the OE shim looks better and is smoother?

Thanks
 

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High Performance Rear Ends
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I never use a pinion depth tool. They are too much trouble and not accurate. Just go by the pattern. What did it look like with the original shim?
 

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Discussion Starter · #3 ·
I never use a pinion depth tool. They are too much trouble and not accurate. Just go by the pattern. What did it look like with the original shim?
This is with the original shim .036

The .011 that the gauge was showing to use was giving the heel and toe pattern.
 

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High Performance Rear Ends
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That doesn't look too bad. The coast side looks a little deep, but the drive side look good. I don't know what would make it better. Does it feel nice and smooth with no noise when turning it fast with an axle?
 

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Double check the pinion depth written on the pinion---sometimes it's hard to make out the numbers, at least for me.
 
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