Hi Guys, I have been trying to get a "good used" Ford Posi 9" diff set up correctly and cannot seem to get the drive and coast patterns in the middle of the ring gear. Specs, Reusing the bearings as they appear ok. Ring gear run-out is about .002-.003" Changed the yoke and used a Ratec supersleeve. Pinion bearing torque is 7 in-lbs, 3.25 gear Ratio, factory (or at least what came out of it was a .018 pinion carrier shim.
I have been up and down the shim stack spectrum-from . 000 to over .025 and nothing seems to get the pattern off the toe of the coast side; without really screwing up the drive side. I have posted pictures of the (factory .018 shim) pattern first, with .012" backlash. Then with a .015 pinion shim with .013 backlash, which seems to center the drive side up nicely but still does not get the coast side up the middle much. Its driving me crazy. I have tried so many shim and backlash settings I am cross-eyed
. I just wanna go for a drive in the hotrod. I have seen a pattern in the Yukon Gear set-up article and it shows a pattern much like this one with the drive centered and coast biased towards the toe and they say its OK. Any suggestions?