hey new here, not sure if this has been covered, if so can someone point me in the right direction.
Just bought this 99 gtp 2 weeks ago and have been fixing things on it to make it nice again. Things i have noticed before today, while driving, never seemed to shift into what i thought was 4th until after 45 mph. and torque converter when you let of gas would drop to idle- less than 1000 rpms. thinking this is normal with this. noticed delayed shift from 1st to second sometimes, looked at trans adapts and found to be around 20 psi. so i know i at least need a pressure control solenoid, was going to do that and filter and gaskets this week once they came in.
well today went for a drive for a couple of hours and it started something new once warm. found it would shift from 1st to second and then would just stay in second. played with shifter, went to neutral and the manual lows and eventually would go into 4th im assuming. doesnt seem like it ever goes into 3rd. did this a few times and then drove home for 30 minutes with no issues. car has 174,000 miles on it. fluid is red, smells ok and is full. Ive been in multiple 4t65e, as im a gm transmission tech. never ran into this 3rd gear issue and not shifting though. have done a ton of torque converters and pc solenoids and reverse issues and what not. but never had one that would not shift to 3rd. no codes have set. any help would be appreciated.
