Originally Posted by dually kid
i run around 2000rpm at 70mph so according to this i have 4:10 which would explain my poor gas milage. anybody out there in the same boat. yall have been very helpful so far. i pull a fith wheel camper on ocasions and when i hook up to that thing u looking at aroun 8 mile to the gallon. i know a tuner would help but whats cheeper, new gears or a tuner
I have 37" Toyos on my truck with 3.73 stock gearing...effectively makes my gear ratio 3.35. I'm currently looking at going to 4.30-4.56s which will make my effective ratio 3.86-4.09. I currently pull a toyhauler, loaded about 12-13,000. While I can climb over most passes at about 70mph, I can feel a lot of drag on the truck...certainly a lot of stress on the tranny and the turbos are really sensitive to any climb in elevation. While I currently get about 9mpg towing, I think I might get better fuel mileage with new gears and lower EGRs.
A numerically low gear ratio can be just as bad as one that is too high.