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 > Ford Class C with 6 speed transmission

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Johnny Hurryup

Tafton Pa.

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Posted: 06/11/19 08:01am Link  |  Quote  |  Print  |  Notify Moderator

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 new tranny??

pianotuna

Regina, SK, Canada

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Posted: 06/11/19 08:52am Link  |  Quote  |  Print  |  Notify Moderator

At highway speeds no improvement because the top gear ration is no different.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Jayco-noslide

Galesburg,Il., USA

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Posted: 06/11/19 09:19am Link  |  Quote  |  Print  |  Notify Moderator

I wish our older Class C had more than it's 4-speed but honestly the 4-speed does just fine. I doubt a difference in MPG would even be noticeable but it would give more options for up and down hills. An old friend has a Chevy pick-up with a 2-speed powerglide and even that is adequate.


Jayco-noslide

DrewE

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Posted: 06/11/19 09:29am Link  |  Quote  |  Print  |  Notify Moderator

Gas mileage would probably not improve much if any due to the new transmission. It was introduced on the E series a year or two ago, if memory serves.

The gap between the top two (highway) gears is a good bit less wide on the new transmission, vs. the five and four speed ones which were basically identical in that particular regard. That alone would make for pleasanter driving in many circumstances.





carringb

Corvallis, OR

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Posted: 06/11/19 09:34am Link  |  Quote  |  Print  |  Notify Moderator

The 6R140 has double overdrives, with the top ratio at 1 to 0.67, vs 0.72 for the 4R100/5R110, 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.

* This post was edited 06/11/19 11:27am by carringb *


Bryan

2000 Ford E450 V10 VAN! 450,000+ miles
2014 ORV really big trailer
2015 Ford Focus ST


BruceMc

Oregon - Willamette Valley

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Posted: 06/11/19 10:36am Link  |  Quote  |  Print  |  Notify Moderator

We had that 4 speed in our 2000 Four Winds, and it sorely needed a gear between 2nd and 3rd. When pulling hills, it was either screaming at 4500 RPM in second at 50MPH (or thereabouts) or lugging in 3rd for a few second before it'd drop to 2nd again....
Any time that thing saw a rise 5 miles away, it'd shift out of 4th, and it'd do only about 45-50 MPH on any significant grade.

If at all possible, get one with the 5 speed, or ideally, the 6. I understand I had that anemic V10 with that 4 speed as well - the newer V10s have better HP.

Our current ride, a 2016 Sunseeker 2250 on Chevy 4500, has a well-geared 6 speed coupled to the strong 6L V8. I can easily hold the speed limit on any hill, though I let it fall back as I'm never in a big hurry to get to the top.


'16 Forest River Sunseeker 2250SLEC Chevrolet 6.0L
Previously:
'00 Four Winds 26Q Class C (Ford E350 V10)
'96 Kit Sportsmaster 212f Fifth Wheel/'93 GMC Sierra K2500
'91 SunLite poptop truck camper
and the first: a Wildernest flip-top canopy.


T18skyguy

Eugene, OR

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Posted: 06/11/19 10:43am Link  |  Quote  |  Print  |  Notify Moderator

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.


Retired Anesthetist. LTP. Pilot with mechanic/inspection ratings. 2017 Jayco Greyhawk 31FS. Wife and daughter. Three cats which we must obey.

pnichols

The Other California

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Posted: 06/11/19 11:02am Link  |  Quote  |  Print  |  Notify Moderator

I think that I've improved my motorhome's V10 fuel economy over what is possible with it's 5-speed 5R110W transmission by retrofitting it with non-stock tires that are larger in diameter. Going to a larger diameter tire makes all gears "taller" in any vehicle for improved fuel economy when cruising.

Since our Class C motorhome is a relatively small one for it's E450 chassis, I don't need the extra pulling power that the E450's 4:56 ratio differential provides, so I may as well get some improved mileage through use of larger diameter tires.

An E350 chassis has a 4:12 rear differential ratio, so larger diameter tires on it under a motorhome might make it lug down on hills a bit.


Phil, 2005 E450 Itasca Spirit 24V

Gjac

Milford, CT

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Posted: 06/12/19 10:23am Link  |  Quote  |  Print  |  Notify Moderator

pnichols wrote:

I think that I've improved my motorhome's V10 fuel economy over what is possible with it's 5-speed 5R110W transmission by retrofitting it with non-stock tires that are larger in diameter. Going to a larger diameter tire makes all gears "taller" in any vehicle for improved fuel economy when cruising.

Since our Class C motorhome is a relatively small one for it's E450 chassis, I don't need the extra pulling power that the E450's 4:56 ratio differential provides, so I may as well get some improved mileage through use of larger diameter tires.

An E350 chassis has a 4:12 rear differential ratio, so larger diameter tires on it under a motorhome might make it lug down on hills a bit.
Hi Phil, what was you MPG before and after the tire change?

Johnny Hurryup

Tafton Pa.

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Posted: 06/12/19 10:29am Link  |  Quote  |  Print  |  Notify Moderator

My old'99 Ford F53 Class A chassis with the V 10 and 4 speed trans was doing about 2600 RPM at 60 mph in overdrive. What can I expect from a Class C ,E 450 6 or 5 speed at 60?

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