Not sure if this belongs here or under Repower/Transplant, so please move if I guessed wrong.
My brother and I are finishing up a LB7 swap into his 2003 Suburban. The tow/haul button works, light comes on, transmission goes into tow/haul shift pattern. Holding it down for O/D Off does not work. Transmission remains in overdrive, O/D light doesn't come on in the cluster. It is like it isn't requesting O/D Off at all. But we can toggle tow/haul at will.
The wiring diagrams indicate the button on the shifter goes to the BCM, and that talks to the transmission. This leads me to believe the BCM may need reprogrammed. I have a Tech2 and TIS2000, but... what should I flash to it? A crew cab pickup OS? I don't want to lose any of the subruban stuff, like rear HVAC controls or MagRide.
My brother and I are finishing up a LB7 swap into his 2003 Suburban. The tow/haul button works, light comes on, transmission goes into tow/haul shift pattern. Holding it down for O/D Off does not work. Transmission remains in overdrive, O/D light doesn't come on in the cluster. It is like it isn't requesting O/D Off at all. But we can toggle tow/haul at will.
The wiring diagrams indicate the button on the shifter goes to the BCM, and that talks to the transmission. This leads me to believe the BCM may need reprogrammed. I have a Tech2 and TIS2000, but... what should I flash to it? A crew cab pickup OS? I don't want to lose any of the subruban stuff, like rear HVAC controls or MagRide.