Instead of leaving it to phase 3 or 4, I decided to go ahead and purchase Quaife ATB torsen gear "limited slip" internals for my 3.46:1 differential. They had me remove my open differential, and perform an extensive series of measurements to not only "triple" verify compatibility, but so they would know if I needed any shims for the crown gear. As it turns out, the measurments were an exact match, so no shim should be needed. I will be doing a lot of checking just in case though.

Here's a link to the Quaife part , and some related pictures. Some of those measurements needed a flat reference, so a spare piece of granite in our kitchen served well. Yes, my marriage survived. No, I will not be washing parts in the dishwasher.



I am really happy with the apparent condition of the crown gear in the 3.46:1 diff.



Granite makes a good flat reference!!