My 02 trans is still not staying locked up (55-60) in OD. I've done tried the noise filter, resetting the apps, and other suggestions, yet none has worked. But last night I drove it and had on the AC but the air wasn't very cold, so I turned the AC,vent, and all off and rolled the windows down. Almost immediately the trans locked up and did perfect, no shifting in an out. Noticeing this I turned the AC back on, shifting started again. What is going on?? No cold AC but trans acting up.

 

all i can come up with is your still getting an electrical disturbance through the system causing it. and if it works fine with the ac off you know where the problem is coming from now to just track down where in the system its bleeding through. could be the pcm throwing it out funny or some wires rubbing together.