Thanks for the thoughts...it sounds logical. The gears have less than 4000 miles on them so they shouldn't be worn out or anything. It didn't seem as though I was able to put any major loads on the rear but I guess I managed to. Ooops! My "testing" mostly consisted of carefully letting into it off the line tying to get the best launch with minimal tire spin. Quite honestly I'm having a hard time getting those old school BFG radial ta's (275-60-15) to hook up much at all. At the track with the old motor/trans, breaking low 1.9s in the 60ft. was a challenge. I have tracked down a speed shop guy I know who is known for his work on rears for race cars. He should be able to get to it by the end of the week. Hopefully it won't be major surgery. I've got a nice 10bolt rear in the garage though I'll asume it won't be necessary.