2nd transmission and I have about 60,000 on this one total millage 150,000 aprox. When the car warms up after about 20 min. of driving it wont switch gears it just revs up. I took it to the shop the guy said its got no codes and he wants to rebuild it for $1600, so I started looking into what's involved. After some digging I did see that a shift control module could be the problem. The engine runs good so I think I might go this rout. What's the best way to diagnose the module, and could the torque convertor module be an issue to ?