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2015 F150 possible mpg improvements

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Old 03-07-2014, 08:31 AM
CatBob CatBob is offline
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2015 F150 possible mpg improvements

In the early 70's I drove a ford box truck with a 2 speed rear differential. I would like to see this put into the new F150's. Best of boyh worlds. MPG's and towing capacity. What do you think.
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Old 03-07-2014, 10:21 AM
Frdtrkrul Frdtrkrul is offline
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I feel when the new 10 speed autos come out later next year or 2016 the mileage will improve more significantly. Or the laws of diminishing return could prove this wrong.
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Old 03-07-2014, 12:38 PM
CatBob CatBob is offline
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Seems to me, even with a 10 speed trans, being able to switch between a 3.15 diff and a 3.73 would be a plus. It would help ford to meet the new cafe standards. 3 or 4 mpg hwy adds up.
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Old 03-07-2014, 01:19 PM
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You realize that's how the automatic transmissions work now, right? Instead of a split diff, there's a second gear set in the trans. A "6 speed" isn't 6 separate forward gears, is a 3 speed auto in front of an overdrive unit that combines 3 gears with 2 for six total. It's a manual trans and a split axle all combined into a single unit. It's been like this since 2003 when the 5R110W came out; there are six total gear combinations but only 5 are used.
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Old 03-08-2014, 05:53 PM
Frdtrkrul Frdtrkrul is offline
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The 6R140 is a double OD not a triple. 4 forward gears with double ODs. Same with the Allison 1000 after they changed it.

The 8 and 10 speeds would be like having an old 4 speed manual and a Gear Vendors Gear splitter/OD unit all in one.
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