so the challenger in my post now has 114,000 miles with the original syncro's, gears, shafts, and shift plates.
It needed bearings, gaskets and seals - so what longevity are we loosing running ATF?
I don't have a car with that few miles. The 67 has 400,000 miles and the 64 had about 250,000 miles when it was totaled for the last time. I'm still running the trans from the 64 with a 67 extension housing. I put them back to new. Next time i rebuild one, I'll take pictures. So, you don't think you have any wear on any of those parts? 4 speeds thru the 70's were some of the best made. Quality, metalurgy and tolerances were not as good in the later years. Will they still run good with a little wear? I think you have already answered that question, in your case. We all make our decisions, based on experience and knowledge. From what I have seen, rebuilding more than a few Mopar 4 speeds, I will not use ATF.
