Ford Class C with 6 speed transmission
I see that the newer Fords with a V 10 have a six speed auto transmission. When did they replace the old 5 speed (I had a '99 with only a 4 speed) Would one expect to get better gas mileage with the n...
Forum Discussion
carringb wrote:
The 6R140 has double overdrives, with the top ratio at 1 to 0.67, vs 0.72 for the 4R10/5R110, and was designed with fuel economy improvements in mind. One operator I spoke to found their new shuttle buses were seeing about 20-percent highway fuel economy. There were other improvements made besides the gear ratios, to make it more efficient. The difference probably isn't as dramatic in a motorhome because aero drag is much higher.
The V10 got the 6R140 for the 2016 model year, then it was added to the 6.2L V8 for the 2017 model year.
Good information. I had a 96 Jayco Eagle with a 460 and the E4OD. I had the Banks headers and if I kept my foot out of it I got 10 mpg. Now I have a 2017 Greyhawk with the V10 and 6 speed transmission and I still get 10 mpg, the big difference being the new rig is 10 foot longer and much heavier. I've been really pleasantly surprised with this excellent drivetrain. I had expected like 7-8 mpg. I also have an 03 box van with the V10 and the 4R100 and the mileage is horrible.
