[Jeff Chambers]

You've gotten lucky so far then Pony. I just installed an Eaton posi in a 2000GT last night after they broke some axles a few weeks ago. The Eaton was 0.031" wider than the stock posi. Had I simply used the same shimming, the bearings would be burnt before they even got the car back to their house. I'll agree that its not the mystical black box that some think it is, but it is one of the more sensitive and involved tasks on the car besides laying up a crank.

GT93, there's a write-up on my website on gear swaps. The thing to remember is that you get what you've put into it. Sloppy, inaccurate work will most likely lead to noisy gears and short-lived bearings. Take lots of measurements and write them down. Take your time and don't rush it...the clearances and preloads are everything to the longevity of the rear.