Silverado 4 x 4 Transmission problem PLEASE HELP!!!

I think you're missing some critical information here....like what year, make, model, and engine the original vehicle was.....

Sorry, 1999 Chevy Silverado Ext Cab 4X4, 5.3 Liter, 4L60E Transmission.

sounds like the computer ain't getttin' the speed sensor info from the new trans.

-- Old Crow "Yol Bolson!" '82 FLTC-P "Miss Pearl" '95 YJ Rio Grande BS#133, SENS, TOMKAT, MAMBM

Did you plug the vehicle speed sensor back up? Not sure but just A idea. Is the VSS the same? I think a 99 is looking for a 4K VSS signal but I don't know what the output is on a 06. Might want to swap in the VSS from your original tranny. My opinion is either a wrong VSS, bad VSS or maybe you stretched and broke the wires to the VSS.

Keep in mind I am not fortunate enough to be looking at factory manuals. Pulling it off the top of my head. There could be other problems. Have it scanned, find out if there is a VSS signal. On a 700R4 both mechanical and optical VSS's were in the T-case. I THINK they were moved to the tranny body just in front of the T-case/tailshaft flange on the E models. If the VSS output is diffrent, IF, it won't change with a sensor change, you have to swap the reluctor ring or the buffer. I may be way off but its something to look at.

Thanks for all the reply's. We found a wire up near the bell housing that had came apart, must have hit it when putting the dipstick back in. Thanks again.