Help Doc Diff -- Pinion Nut Different

Anybody
I bought a Ring and Pinion Ratio 3.55 with a fine spline my oem gear is course spline the nut and washer are smaller what size nut do I need if Doc Diff sees this what is your phone # Need parts. Thanks Bob

Try this, measure the OD of the threaded part
of the pinion, then count the number of threads
over an inch that will tell you what you need.

The 10-spline pinion uses a 3/4"-16 thread while the 29-spline uses 7/8"-14.