F250 3.73 to 4.30 axle ratio
I have a 2017 F250 4x4 crew cab, 160" wheel base, 6.2l gas, 3.73 gear ratio. I am trying to see if having 4.30 axle ratio gears installed will make much difference regarding 5th wheel towing. I noti...
Forum Discussion
BenK wrote:
Most diff gear ratios are about 10% from the one higher and lower
So the torque multiplication is around 10% more or less
A 3.73 is about 10% lower (numerically) than a 4.1...therefore about 10% less torque multiplication
Truck labels only tell what it left the factory with. Some folks like me, have changed the gear set to a different gear ratio
The string method doesn't care what the label says...
3 year old truck that the guy probably bought new so the door label is probably accurate. The OP didn't ask how to determine his axle ratio anyway. The string method would be invaluable if there were no other way to find out, but observing engine rpm at 60 mph (on GPS, not speedo) and doing a little math is probably more accurate. And if one doesn't want to do math there are many online calculators that do the math for them.
