Axle Ratio, new truck
Hey all, I think I know the answer but just wanted to make sure. I am looking into a 5th wheel ~15k GVWR and am buying a truck. I want an f350 and may order a new one to get exactly what I want (there...
Forum Discussion
Michelle.S wrote:
Here's the 1st gear ratio for GMs 6 speed Allison and the new 10 speed:
New 10 speed 4.540 : 1
Old 6 speed 3.094 : 1
So with the lower first gear the 10 speed will give you the same overall pulling power with the taller differential gears.
If I wanted to pull a 15,000# 5er with a gas engine I want all the advantage I could get. The 3.73 gives 17,000# pulling capacity, 4.30’s gives you 20,000#.
My 2016 Cummins with six speed, and 3.73’s gives me 25,024# of pulling power, next 5er will likely top out at 17,000#.
