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Old 04-26-2012, 08:47 PM
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4.10 Gears or Electronics

So i have a 2002 F350 with 7.3 crew cab 4x4 3.73 4r100 35" intake 4" exhaust wastegate sct with custom 140+ HP ok down to biz i love the truck it gets 21 mpg but when i tow my toy hauler (11K lbs) and i gotta keep the truck n tailer up to 65+ to keep it in the power band so i was wondering if i should go with 4.10 gears or get a better towing tune and maybe the banks trans command? or any other ideas to bump up the towing and not kill the wallet and MPG's.... please help
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Old 04-26-2012, 09:54 PM
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You are getting awesome mileage... so good, that I find it hard to believe... Anyways, itd be cheaper to put smaller tires on the truck than regear.

Whose tuning are you running now?
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Old 04-26-2012, 11:11 PM
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Innovative Diesel i got the 140+ and just cruz and its nice n when i did all the math and found i was getting 21 with a lifted 4x4 i was shocked and super happy

Last edited by 2002 F350; 04-27-2012 at 05:22 AM.
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Old 04-27-2012, 08:57 AM
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your towing your toy hauler on a 140 tune with 35s? what are your EGTs like?

I play hell keeping my truck wound up in the higher tunes when towing with my 6sp, maybe you should look into a tow tune with a little less timing and fuel.

Jim
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Old 04-27-2012, 09:07 AM
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No I tow in thr sct stock towing tune but I was wondering if a custom towing tune would be any better or if its not enough to matter .... I was just saying its my daily driver n I get great mpg n don't wanna lose it haha
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Old 04-27-2012, 10:29 AM
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4.10's are the best bet. But it's a chunk of your wallet because you need to change two.


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Old 04-27-2012, 01:22 PM
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4.10s are gonna kill your milage and any truck with a turbo you have to keep the rpms up to the power up and egts down. Turn the od off if you're have problems but if egts are in check i wouldn't worry
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Old 04-27-2012, 02:20 PM
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OD is off when I tow ... If I have it on its down hill
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Old 04-27-2012, 02:27 PM
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unless there is something wrong with my truck; I can tell you 4:10's are going to kill you.
My truck is an 03 F350 CC LWB DRW with 4:10's.
I get 10mpg in the winter and 12-12.5 in the summer and this is empty. granted I only drive 15 miles to/from work, I get the worst mileage ever.
I think 3.73's are ...Nevermind
with 35's and 4:10; you should bring your gear ratio back to around stock (3:73) but you will most likely see a slight drop in fuel mileage.
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Old 04-27-2012, 02:32 PM
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Yah i want the 4.10 but since i dont tow all the time i was hoping i could fox it with couple little things......... My dad had a 03 f350 drw with 4.10 gears and 4" exhause and he gets 16 high way..... I want to do everything i can to keep my milage tho
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