Tks guys
Georgeb- tks for the link it actually gimme a much better idea what I have and what I'm looking for
Was comparing my sm465 (top gear 1.00) to a nv4500 (top gear .73)
Just realized if i increase my tire size to 35s than my truck will do 65 mph at 2300rpms
And it dose 65mph at 2700rpms on...