I have a 2007.5 lmm 2500hd, duramax w/6sp allison, 6 inch lift on 35's. quite a bit of work done, found it was very hard to get the speedometer back to normal because the abs would get upset after changing the ratios via efilive. The abs is not programmable, third gen was, fourth is not. I have access to a tech 2.
What I would like to accomplish is to change the front and rear diff gear ratios to get back to a stock final drive ratio, maybe a little higher but either way close to stock final ratio.
after finding out how sensitive the abs is to changes in the ecm speedo ratios, is it possible to change the gearing, and change my ratios in the tcm and ecm, and retain the abs system? I very much want a functional speedometer, but dont want the light associated with a pissed off abs system.
All feedback is appreciated. I need to study this before I dive in, changing the gears is easy but fixing the lights is much harder!
What I would like to accomplish is to change the front and rear diff gear ratios to get back to a stock final drive ratio, maybe a little higher but either way close to stock final ratio.
after finding out how sensitive the abs is to changes in the ecm speedo ratios, is it possible to change the gearing, and change my ratios in the tcm and ecm, and retain the abs system? I very much want a functional speedometer, but dont want the light associated with a pissed off abs system.
All feedback is appreciated. I need to study this before I dive in, changing the gears is easy but fixing the lights is much harder!