rear end gearing - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 09-13-2012, 06:47 PM Thread Starter
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rear end gearing

Would I be able to get more than 13 mpg with my 7.3 dually if I changed the 410 to 373 gears. I have done the exhaust and intake. there was a superchip plugged into the ecm under the dash when I got it.

1999 F-250 Crew cab
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post #2 of 6 Old 09-13-2012, 06:53 PM
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Depends on the tire size, it will make the gears taller so it will work harder to keep going

-Jeremy

Got A Few Rides...




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post #3 of 6 Old 09-13-2012, 07:03 PM Thread Starter
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Those are listed. 255/85/16. Some of the single rear wheel trucks run 355 gears.

1999 F-250 Crew cab
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post #4 of 6 Old 09-20-2012, 06:31 PM
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high gears would likely help you unloaded mpg, but hurt your towing ability and mpg.

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post #5 of 6 Old 10-18-2012, 09:47 AM
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I get about 16.5 around town empty and about 11 towing 10K. On the highway my milage is a little better as long as I keep it at 65 or below. I also have 4.10s but with the stock 235/85 tires.

2000 F350 CC Dually 4x4 Lariat 7.3 6spd, Leveled, 05 front end & mirrors, 4" turbo back, 38R, WW2, regulated return, Airdog 150, intake, Swamps IDM, tuned by PHP, Gear Vendors, 19.5s
Coming soon: 250/200s, studs, stealth hpop, as soon as I get springs and pushrods.
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post #6 of 6 Old 11-14-2012, 01:43 PM
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My cts tells me i get 13mpg , i have 4.88's. I don't get any worse when towing, until temps near 0*, then she gets worse. I stay at 60-65 most of the time, and alot of city driving, my truck weighs 14,800 lbs. and runs on 19.5's

2004.5 F-550,4x4,6.0,auto,CTS monitored,
Performance Machine egr delete,caterpillar elc,blue spring, CTS Monitor,flat plate agm batteries,K8 code, super tow pkg. (4.88),twin line recovery wrecker.
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