Originally Posted by 95geo
while towing keep the rpms at or below 2k. from the sound of it you were on stock tires and doing 70-75 puts you around 2300-2400 rpm.
i get about 12.5-13 when i am even 100 rpm above 2000
285/75/16 Firestone destination tires I dont remember the RPM's
Originally Posted by JOE
Are you running the "moonshine" tune? if not, who's tune are you running or did you make it?
That efilive is pretty sweet but I'm not going to buy it until I build up my trans.
only thing done to the duramax is a superchip everything else is stock.