Toyota Repair: transmition slips after getting hot, toyota camry, salvage yard

Question
hi bro,
i have tipical problem with transmition
i have toyota camry 1991, with automatic electric transmition,it works fine untill its get hot like upto 30 min or 25 miles, then it slips gear from 3-4
and 4-5 ( i always put over drive on),i went to michanics , they can't find any problem, they said they have to open to find problem
i have 109k miles, all original engine & transmition
please guide me to solve this problem

thanks in advance for ur great information &
help on this site .

Answer
When an automatic transmission is slipping when shifting to another gear it usually means there is an internal pressure loss and the transmission will either have to be overhauled or replaced, I recommend replacement with either a remanufacctured unit or a good used one from a salvage yard that specializes in engines and transmissions.