4:10 or 3:73 ?
Possible upgrading to Ram dually. I'm pulling 12,500# gvw with SRW and 3.42 rear end. Usually lock 6th gear out. Plan is to move up to new 15,000# gvw 5th. Not sure if I want to get 4.10 or 3:73. Wh...
Forum Discussion
4x4ord wrote:Pop-Pop C wrote:
You may sacrifice some mileage with the 4:10 as a daily driver but when on the road will be highly beneficial. There can be steep hills or mountains where ever you may go.wouldnt want to limit your self just to,flat lands. Not sure where that would be.
You'd have a hard time finding a circumstance when the 4.10 would be beneficial over 3.55 gears towing a 16,500 lb rv. It would take an 8% grade at 60 mph before the 6.7 would even start pulling down from 2600 rpm in 4th gear with the 3.55 final drive. The 4.10 is reserved for heavier loads where the engine hasn't enough power to manage 60 mph.
If we pick 60 mph as a desired speed both the 4.1 and 3.55 will require 3rd gear in the Ford for near 2600 rpm (max hp)
At 2600 rpm (max hp) the 3.55 will net 57 mph where as the 4.1 will limit the speed at 49 mph.
I would say the 3.55 is the better choice for the Ford 6.7.
