hi all,
please help - I have an LS3 with ECU which came out of a 2007 Silverado with O/S ID 12614088 and the ECU is calibrated for an auto box - but I have a manual box installed - and I just cannot program the ECU at all -- no changes are accepted.
I keep getting an error "transmission mismatch TCM detected" I am trying to change the gearbox to a manual one and then start tuning ...
anyone have any ideas?