20 Oct 09, 02:18 pm
you're gonna need some RPM to turn big tires at 60, unless you have a big block or turbodiesel. Mine runs about 2500 RPMs at 60 MPH with 5.24 gears and 42's. The 6.2 even with the pump turned up, K+N air filter, and straight pipe barely has the guts to go 60. Hit some hills and I lose speed quickly.