The auto trans in my 91 Supra (90,000miles) has developed a slipping issue. It revs a little between up shifts, and completely slips while downshifting under heavy load. The fluid has always been clean/regularly changed with the proper grade ATF since it's been under my ownership. Rebuilding is out of the question financially right now so I'm looking for an additive that you have experienced positive results from. I'm not expecting miracles, but a noticeable change for the better would be nice.
Has anyone tried Lucas Transmission Fix, or TransX?
Thanks!