Ive been having a real whale of a time trying to figure out why my transmissions not working and i finally got a lead. As soon as it started getting hot and i started using the ac, i noticed the transmission would start bucking so hard the cars almost undriveable. When i open the hood after ive had the ac on the engines definitely hotter than usual, but the temp sensors never gone farther than the middle.

For the first 10 minutes or so the transmissions perfect, but seems like as soon as it heats up it stops working. All the fluids are ok it seems like, fan turns on. any ideas?

 

What year?