Okay, after all my diagnoses the diff still locks up.
I've taken two apart now and in both right outdrives the one way bearing is losing it's rollers. The instruction sheet says I should file the pins that stick in the outdrive before installing the diff in the car. Could this be the problem, if the pins are touching each other would they cause binding in the one way bearing and finaly can you drive these diffs too hard?
I know it's a lot of questions but I'd like to get it "rolling".