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Thanks for the help. It was the harness manufacturer didn?t hook up the u terminal to transmission. All Works great

2002 Silverado with 4.8. And a rebuilt 4l60e trans. It?s a restomod with painless wiring.

Transmission start out in first and goes to 2 and 3rd gear. Come to a stop and it?s stuck in 3rd gear...

2002

4.8l with 243 heads
stock bottom end

comp cam thumber
int .541
ext 536

duration