Pinion Depth
02-02-2023, 02:52 PM
#1
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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?
02-12-2023, 01:14 PM
#3
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.
The following 2 users liked this post by Camaro71:
NoEmissions84TA (02-12-2023), SbFormula (02-12-2023)
02-12-2023, 09:44 PM
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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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