TowRig.com - Diesel Discussion and Tow Tech

ok I need some info I have a 1996 2wd 3500 auto I am replacing the trans by the first of the year I've leveled out the front end with the rear and I'm getting some slightly larger tires on it tomorrow I want to put a mild fuel plate on it but I am wondering if it will hurt my fuel economy I have 3:54 gears right now.

Depends on your foot action. I didn't have a decrease in my mpg's after I put the plate, injectors and GSK on my 12v..... until I played with the throttle too much. Advancing the timing of your fuel pump will give you another 1 or 2 mpg's.