bubba_89
Registered User
I have 4.10 gears in my 89 f350 dually.. was wondering if I could drop the ratio to 3.73 or maybe even 3.55 and get better mpg and still b able to pull light loads if i have too..
can I drop my axle ratio??
- Thread starter bubba_89
- Start date
Wyreth
Certifiable Noob
Yes, you can drop your axle ratio. It's not a big deal.
I have 3.55's in my 250, and she will still pull 10-15k. Without issue. You will not get as good mileage while towing tho.
It's a trade off, if you mostly tow or haul heavy with the truck. You're getting better mileage with the 4.10's. If you mostly drive it empty or light, and occasionally tow or haul heavy. You'll like the 3.55's
It'll likely be cheapest and easiest to simply buy a 10.25 with the 3.55's already in it from the JY, than trying to change the ring and pinion.
Or you could put a OD unit in it. Then you has both!
I have 3.55's in my 250, and she will still pull 10-15k. Without issue. You will not get as good mileage while towing tho.
It's a trade off, if you mostly tow or haul heavy with the truck. You're getting better mileage with the 4.10's. If you mostly drive it empty or light, and occasionally tow or haul heavy. You'll like the 3.55's
It'll likely be cheapest and easiest to simply buy a 10.25 with the 3.55's already in it from the JY, than trying to change the ring and pinion.
Or you could put a OD unit in it. Then you has both!
bubba_89
Registered User
Well it already has an underdrive unit on it..and found a set of 3.73's online for a pretty good price so looks like im dropping them in.. I dnt mind to pay a lil more in fuel when I do haul anything.
redneckaggie
rebel w/o a cause
if it has an underdrive on it I wouldnt be scared of 3.55s
