rear gearing for 15 speed trans
I have a 379 pete cat 475 engine and a 15 speed trans. looking for best rear gears to put in for fuel mileage. I am on a dedicated 740 mile trip a day so I am pretty much 70 mph all day. 22.5 lp tires. light loads and run in Missouri. thanks for any help.
Is this a worthwhile discussion?