8one monte carlo

I have a lt1 and just wired in a 4l60e. its a 12 pin not a 13 pin connection. when i go to drive the car the transmission won't shift out of 1st gear automatically until about 6k rpms. If i shift it manually from 1st to 2nd it shifts but then it tries to shift into 3rd but it just slips. If I allow it to shift automatically out of 1st it shifts fine into all the other gears after that, no slipping in 3rd, but it wont downshift. i can manually make it downshift but it wont go back to 1st gear. starts me off in 2nd gear, no 1st. if i shut the car off and restart it i have first gear again. i dont know what the computer came from originally and need help figuring that out, i cant find anyone with the broad casting codes, without knowing what the computer is from i dont know if this is the right transmission for my lt1. please help

jaycenk

iTrader: (1)

It sounds like it has no power. It's in limp mode.

8one monte carlo

do you mean the transmission has no power from battery?