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double checked all my wiring and it is all correct.
i did use bluecats trans tool and it seemed to help my downshift.

do it seems programing and not mechanical.

any idea that i change from the...

I’ll double check the pin outs

I would think I’d get some sort of check engine light

hello everybody
i have a 07 suburban that i have swapped out the 4l60 for an 02 2500hd 4l80.
The 4l80 had 325k miles on it so I decided to rebuild it before I installed it.
internal duel feed and...