Judge my gear pattern.

[VandykeT/A]

 

[big gear head]

The pinion is too deep. Take about .010 out.

 

[VandykeT/A]

Rather than pressing this on and off do you see any problem using a dummy bearing for set up. I started out with it but started getting paranoid it would move. Both bearings are same brand just inside is ground out.

 

[badazz81z28]

I used a set-up bearing on my 10 bolt and worked out perfectly. However Both bearings were new...Both were Timken. Had one of them oversized so it would slip on. Of course, the set-up would still have to be verified with the actual bearing, but mine was dead on the same.

 

[VandykeT/A]

I’ve always used a ground out bearing for set up but this thing has fought me more than any of them so I started just pressing it on and off thinking some magical way the two bearings could be different. Both are national bought the same day from the same place. I had a 7.5 move once between bearings and I’ve been paranoid ever since.

 

[flht99b]

OEM GM gears or aftermarket? We recently did an '81 10 bolt 8.5" rear with Yukon 3.73's. 1st set we could not get a good pattern, Yukon sent a second set which we were able to set up properly. My OEM GM 4.10's also set up without a problem.

 

[VandykeT/A]

Aftermarket. They’re Quick performance. All I seen was good reviews on them before I ordered them. Everything I’ve ever messed with in the past were either Motive, Ford Racing, or GM and I’ve never had this much problem.

 

[big gear head]

Post pictures each time you change the pinion depth. I don't know how it's moving because you aren't posting pictures when you make changes.

 

[VandykeT/A]

I started over from scratch. This is with no shims.

 

[VandykeT/A]

This was with a .020