Ford super duty 3.31 rear end. Will it be a big mistake. ?
Pulling a 37 foot Cedar creek with a f350. Diesel. Would the 3.31 rear end work or should I get the 3.55?
Forum Discussion
StirCrazy wrote:lenr wrote:
My bad on 20" tires requiring 3.55. Looks like the last year for that was 2019. I still wouldn't choose it for pulling a DRV. Not that it matters here, but the 6R140 does not have a 1:1 ratio. 6th is 1:1.15. I believe the Allison 1000 does have a 1:1 ratio.
Im going to have to go look at the build sheet in my 2014, I have the 11500 gvw with the 20" wheels but I was sure it said I had the 3.31's
. I have to definatly check that. all in all dropping a gear out of OD on a steep climb is what you should be doing anyways for better efficiency , I do all the time on big hills, on the 10% grades I may drop two, but I am pulling a little more weight.
Steve
There's a couple grades I pull every year ,I just drop it in to 4th ,and let her run . I don't push either one , run them about 55 mph.
