I take it you are using the tapered roller brgs. There is a spacer that goes between the 2 brgs. It is machined to match the brgs. & provide the proper preload. You may have the wrong spacer or you left the spacer out. You should be able to tighten the pinion nut any amount without it locking up.

George


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
In the Gallery Forum