I have a 2002 6.0 LQ4 motor with the ECM and wire harness. This came out of a 3500 4x4 and it had a 4L80e trans I think. This is my question what years of 4L80e trans fit this harness or would it be easier to get a 4L60e and have the wire harness reworked and the ECM reprogram for the 4l60e. I’m not finding any 4L80e 2 wheel drive trans.

 

let me try this how hard would it be to install a 4l60e in a ecm and wire harness thats made for a 4l80e?