Originally Posted by DoctorDiff
Richmond and Motive 742 casting gears are identical.

Other than the pinion spline count, Richmond and Motive 489 casting gears are identical.

They are both made in the same factory in Italy on the same machinery.



I would be surprised if they weren't. Most of the stuff I see is 9" and I've seen some ugly Richmonds the last few years. Broken (shattered) teeth. gears that look like someone took a disc grinder to the contact area. I assume these guys are putting actual gear lube in their rears.

If the results don't match the theory, change the theory.