: 700r4 still screwed up! Lock up problem \'88 k-5 REVISITED Hey Guys, Thanks for all the help on this in the past ... still not working. Just reread the original thread and am not sure where to go from here. Replaced the Throttle Position Sensor which had no effect. According to the shop manual under "no converter clutch release" 1.solenoid ... external ground (works when cold but not when warm doubt this is it) 2. converter ... internal damage (replaced twice with no effect) 3. oil pump assembly ...converter clutch apply valve stuck (Conceivable that this is sticking as it gets hot) ... anybody know where this is located? Can't find it anywhere in this book. Is it something I can/ should replace with the TCC solenoid while in the pan? Seems to me that the TCC solenoid may stop working when hot? . For those that don't know ... had my tranny rebuilt after returning many times now the TCC will not disengage when warm. Works perfectly for 15-20 minutes at highway speed then quits. Any suggestions would be appreciated. Going on 3 months of torture. Anyone want a truck?