Ok guys so I got tired of lookin for what I needed in the forums and to no luck so I decided to make a new thread. So heres my problem: Before my engine decided to kick the bucket I was having tranny problems with it not bein able to shift to Overdrive. i have a 4L60E with around 107k miles or so and it popped up a OBDII code of a sort (cant remember off the top of my head its been a year since I drove it or fucked with it) and stated that it was the Tranny Shift Control Solenoid so I wen to autozone and replaced it put new filter and oil but to no luck it still did it. Can anybody shed some light as to what might be goin wrong with it? I wana try and fix it but if I have to rebuild it Im just gona upgrade to a 4L80E.