My 97 sts has a hard shift from 1st to 2nd when hot only. I have replaced the 1-2 shift solenoid and the shift solenoid. What else can I do. No codes ever appear. Has anyone encoutered this one? Derek

 

Thanks, for the comment but what could possible be the problem with the engaging and disengaging of the transmission. I was told that it could possible be a speed sensor, and if so there several to choose from.

Please help !!!