Job #3 trucks - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 8 (permalink) Old 01-03-2008, 01:39 AM Thread Starter
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Job #3 trucks

Part of the article from pickuptruck.com

Quote:
Here's a summary of Job 3 rear axle changes across the Super Duty lineup:

* Single rear wheel (SRW) F-250 and SRW F-350 Super Dutys with 5.4-liter Triton gas V8 engines receive standard 3.73 ratio non-limited slip differential rear axles that replace previous 4.10 ratio non-limited slip diff rear axles. Expected fuel economy improvement of 0.5-mpg.

* SRW F-250 and SRW and dual rear wheel (DRW) F-350 Super Dutys with 6.8-liter Triton gas V10 engines receive standard 4.10 ratio limited slip rear diff axles that replace previous 4.10 ratio non-limited slip diff rear axles. No change in fuel economy.

* SRW F-250 and SRW F-350 Super Dutys with standard 17-inch and 18-inch wheels and automatic 6.4-liter Power Stroke diesel V8 engines receive standard 3.55 ratio non-limited slip rear diff axles that replace previous 3.73 ratio non-limited slip diff rear axles. Expected fuel economy improvement of 1.5-mpg.

* SRW F-250 and SRW F-350 Super Dutys with optional 20-inch wheels and manual or automatic 6.4-liter Power Stroke diesel V8 engines receive standard 3.73 ratio limited slip diff rear axles that replace previous 3.73 ratio non-limited slip diff rear axles. No expected fuel economy improvement.

* DRW F-350 Super Dutys with 6.4-liter Power Stroke diesel V8 engines receive standard 3.73 ratio non-limited slip diff rear axles that replace previous 4.10 ratio non-limited slip diff rear axles. No expected fuel economy improvement.

Asked why these changes are being made at this time, Mr. Sherwood says, "Ford is constantly looking to innovate with its trucks. Fuel economy is on people's minds right now and we're not going to wait until the next model year to make a change. We're going to implement changes like this as soon as we can."
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post #2 of 8 (permalink) Old 01-03-2008, 02:20 AM
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I don't see these changes making that big of a difference. Infact I think the lower gear ratios might make the mileage go down due to the engine working harder going up the hills.

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post #3 of 8 (permalink) Old 01-03-2008, 03:03 AM
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the only way I can see any mpg gain is if you do only highway driving, the city driving is going to $uck !!
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post #4 of 8 (permalink) Old 01-03-2008, 03:10 AM
 
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The only use for the 3.55 is for people that use their truck as a daily driver for going to go get groceries around the city. But even highway driving would suck if any hills were involved. On top of that you have to keep using 18 inch wheels and below for it too be a benefit. Even with a lift and some bigger tires the 3.73 feels a bit strained sometimes.
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post #5 of 8 (permalink) Old 01-03-2008, 03:34 AM
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My 3.73's feel good with the 37'... actually a little better then with the stock tires and wheels (20's) I run at about 12psi boost going 70 on the speedo but ~75mph actual...

But yeah I dont see those "updates" helping any... on a flat road that would be all those lower gear ratios would be good for! If you plan on towing.... wow...

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post #6 of 8 (permalink) Old 01-03-2008, 03:36 AM
 
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can somebody school me on the way the job nomenclature works?
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post #7 of 8 (permalink) Old 01-03-2008, 03:44 AM
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I take it Job3 is still 2008? 3.55's would help a lot at 75-80 mph. And I read this too...

"Ford is replacing standard 3.73 ratio rear axles on certain F-250 and F-350 Super Dutys with 3.55 running gear and has lengthened the underbody chin spoiler by 100-mm (3.93-in)."

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post #8 of 8 (permalink) Old 01-05-2008, 01:03 AM
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Quote:
Originally Posted by 2008TTCC
My 3.73's feel good with the 37'... actually a little better then with the stock tires and wheels......

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