I was wondering if anyone knows the pinion depth for Richmond 3.73s(ballpark) on a 7.625 10 bolt GM rear end. This would greatly help me in the time it would take to rebuild my rear end. Thanks!

 

There's no set depth. It needs to be adjusted per what the gear-tooth-pattern is.

 

Every Richmond gears set I have seen/installed has had the pinion depth etched on the end of the pinion gear. In many cases the pinion depth is slightly different, even on gear sets of the same ratio, due to manufacturing tolerances.

Even if/when you have a pinion depth figure, you should still check both the drive and coast patterns and adjust accordingly to get a proper pattern. Don't rely strictly on a given pinion depth or you may end up with a noisy gear set.

 

The number etched is a good starting point; but 99% it will need to be adjusted somewhat due to mfg variations in the axle housing and pinion bearings.