Pinion Depth
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Junior Member
Joined: Mar 2019
Posts: 12
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From: DElaware
Car: 1982 TransAm
Engine: 8
Transmission: 200C Automatic
Axle/Gears: GU3 2.93
Pinion Depth
I have a 1982 Trans AM with a 10 bolt 7.5 inch rear end GU3 axle. I am rebuilding but cannot find an actual number for the pinion depth setting. The repair manual only shows how to use a gm tool that tells you the shim thickness needed but not the actual depth measurement., can anyone help?
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Joined: Jun 2012
Posts: 1,367
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From: Canada
Car: '18 Chev Camaro SS 1LE
Engine: LT1 6.2L
Transmission: T56
Axle/Gears: 3.91
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Joined: Dec 2007
Posts: 67
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Re: Pinion Depth
Always start with the same shim (thickness) that came out of the axle. Without an old shim, 8/10 times the thickness is between 0.029 and 0.034, this should get you started.
When using a depth tool, there is no magic number. There should/can be one scribed into the pinion. It's pinion set specific.
In the end, when using a tool or not, you should always end the installation process by reading the pattern.
When using a depth tool, there is no magic number. There should/can be one scribed into the pinion. It's pinion set specific.
In the end, when using a tool or not, you should always end the installation process by reading the pattern.
Joined: Feb 2017
Posts: 4,174
Likes: 569
From: Meriden, CT 06451
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Pinion Depth
100% agree with Camaro71.
Are you changing to aftermarket gears?
AFAIK, those are the only ones with a target pinion depth measurement scribed into the pinion gear face.
Are you changing to aftermarket gears?
AFAIK, those are the only ones with a target pinion depth measurement scribed into the pinion gear face.
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