2018 SuperDuty DRW - 3.55 or 4.10 Gears?
We are close to ordering the following: 2018 XLT DRW F-350 SuperDuty Powerstroke, 4-door, 4X4 It will seldom be driven empty. It will primarily be used to haul a 4,000 lb truck camper while towi...
Forum Discussion
BradW wrote:
Could I ask one more question of the folks with newer SuperDuty trucks with 3.55 or 4.10 gears? What kind of rpms are you turning running down the interstate at 70 towing something? I assume you would be in tow/haul mode? I guess the tranny would be in high gear (6th?).
Thanks again for all the help,
BradW
When I was trying to decide on 3.55's or 4.10's a guy on the Ford forum figured out the different RPM's for the ratios and RPM's. Here it is.
4.10 DRW
4th gear 55 = 2764; 60 = 3015
5th gear 55 = 2061; 60 = 2248; 65 = 2435; 70 = 2622
6th gear 55 = 1624; 60 = 1772; 65 = 1919; 70 = 2067
Sweet spot for climbing: 64 - 75
3.55 DRW
4th gear 55 = 2393; 60 = 2610; 65 = 2828
5th gear 55 = 1784; 60 = 1946; 65 = 2108; 70 = 2271; 75 = 2433
6th gear 55 = 1406; 60 = 1534; 65 = 1662; 70 = 1790
Sweet spot for climbing: 55 - 64; > 74
He considered the sweet spot for climbing the big hills to be in the 2400 - 2800 RPM range.
His figures appear right to me from my driving/towing experience.
