| the trans in this car is a 65TE ,they are known for this problem. the most common cause is a sticking valvebody and pressure control solenoid. Most of the time u will have a dtc in the pcm, the check engine light won't go on. unless u have a trans pressure gauge and a tech 2 gm scan tool this is going to be hard to self diagnose. make sure your fluid is full and not burnt. but most of the time is't low line pressures and and sticking shift valves. most of the time i will replace the valve body and the p/c solenoid. IF this trans has been slipping a while and has that many miles on it it may be worth geting a re-build. The valve body job is not a doityourselfer and costs around $800. But a couple more things to check before balming the trans are a bad mass air flow sensor or after market air filter, bad air temp sensor and rubbed through wires by the a/c reciver dryer they rub on the a/c hose |