Reviewed By Justin C (NAVAL AIR STATION/ JRB, TX) —8/24/2014 7:14 PM
I haven't measured fuel mileage so far, but shifting is smoother. Very easy to install.
Reviewed By Charles S (Greenfield, WI) Reviewed for a 2004 GMC C/K 2500 —8/4/2012 2:30 PM
I bought this so that I could hopefully improve fuel mileage while towing my 14,000 lb trailer. After 800 towing miles I have not seen any change from stock. I do see less downshift on grades which means more HP.
Reviewed By Dave K (Pueblo, CO) Reviewed for a 2001 GMC C/K 2500 —11/5/2014 8:58 AM
First of all I was impressed with how quick it arrived, the experience in using it!I after installing it and driving it I was totally impressed with the acceleration especially from 20 mph onward, the truck acted like it had a blower on it, and when I hooked up my toyhauler which was the main reason for getting the chip, I was very impressed by how it seemed like my truck doesn't have to work as hard pulling,didn't help mileage empty or pulling I have 01 GMC 6.0 200600