Ford 3.31 or 3.55?
I am looking at Ford F350 diesel. I see there are two gear ratios to choose from. A 3.31 or a 3.55. I see they both are rated at 14,000lbs. What would be the differents between the two. Are advantage ...
Forum Discussion
Javi1 wrote:
Diesel...
The 3:31 is only available with 17" or 18" tires the rpm differential is minimal between them and either will work just fine for pulling any load applicable to a SRW F250 or F350. If you want the 3:55 ratio you will need to buy a truck equipped with 18" or 20" wheels. However because of the overall increase in diameter when going to the 18" and 20" tires the 3:55's deliver an almost nil increase in performance over the 3:31.
My '12 diesel has 17" tires and the 3:31 ratio..
A dually F-350 comes equipped with 3:73 ratio...
3.55 ratio is available with 18" wheels but it is mandatory for 20" wheels.
