Wiring harness question...???

I have a ls1 with a 4l60e tranny out of a 98 camaro that i using in an older vehicle. I want to swap over to a t56 tranny, so my question is do i need to change the harness and ecm or just the ecm?? Thanks -Jared

You will have a better chance of getting this answered in the "Drivetrain" forum, than you will on "Advanced Tech". I'll move your post there.

Ttt....