Hi guys, I am trying to set pinion depth on a 489 casting 8.75 chrysler rear.

I have some what seem to be oem used 3.91 gear set.

The depth tool i am using has instructions to follow to check depth of pinion etc. Problem is that there are no markings or stampings on the pinion gear head.. no checking distance or no +2 or anything.

The instructions reference those numbers.

Any help or alternatives appreciated.

I have loose set-up bearings and a micrometer for setting up and taking measurements. I have done this before using the tool and it worked fine. Those gearsets probably had checking distances stamped on the pinion.

Thanks,

Greg

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You may have to start with about an .090" thick shim and check your pattern. PITA, but without a reference number you're flying blind anyway.

Did you get a solid spacer kit too? That makes life a ton easier setting it up.

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