rustednuts is right on. I just picked up my differential today after "monkeying" with my ring and pinion. I should have left the darn setting where it was. I ended up with "noise" so I let a good friend, who runs a 4X4 business and builds these suckers everyday, rebuid mine. I picked it up today with a new 3.38 and a complete overhaul kit. (bearings ect)
.....I think my friend uses some type valve lapping compound to check the pattern, but I think the gear folks send it with the gears.
