Stock Drivetrain w/ 37's - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 77 (permalink) Old 02-10-2009, 01:54 AM Thread Starter
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Stock Drivetrain w/ 37's

I have been contemplating getting a 6" lift for my truck rather than a leveling kit, and it seems as though 37's the size tire I'd be looking for with a 6". So I was wondering how the stock gearing will hold up to 37's (I have 3:73's). Thanks
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post #2 of 77 (permalink) Old 02-10-2009, 01:56 AM
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Yes they will be fine. Dont need to change gears, its really expensive.

Colton

2008 F-250 PSD 4X4 XLT
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post #3 of 77 (permalink) Old 02-10-2009, 02:19 AM
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There shouldnt' be any reason to, these trucks are made to tow 20000 pnds or more so if you think of it in my case. My tires are roughly 10% bigger so my theory is I can tow 10% less. Now I am sure that thats not totaly correct but I only tow 5-6000 pnds, so I am safe no matter what. jsut my 2 cents

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post #4 of 77 (permalink) Old 02-10-2009, 02:57 AM Thread Starter
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Not like I should really be worrying about it, but does anyone know how the fuel economy is with this setup and the dpf still on?
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post #5 of 77 (permalink) Old 02-10-2009, 04:01 AM
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BAD, Just my leveling kit and 34's took it down 2 mpg (hand calculated).
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post #6 of 77 (permalink) Old 02-10-2009, 04:06 AM
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didn't yours come stock with 34's? mine worked out to be 34.5's..... Mine has never been stock but I still run the stock tires/rims in the winter. I dont pay that much attention but I am putting the stockers on soon for a trip so I might write it down this time

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post #7 of 77 (permalink) Old 02-10-2009, 01:47 PM
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Depends on what you do with the truck. I have 37's and I went 4:56's in which now I think was too much wish I did 4;30's. However I tow 16K-18K a lot. Not sure I had to do it but i think it helped. If you don't tow a lot I would leave it 3:73 as gears are expensive. But if you plan to mainly tow with the truck you might look at some gears?? That is my 2 cents!
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post #8 of 77 (permalink) Old 02-10-2009, 01:57 PM
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I was getting under or around 10 on the freeway...

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post #9 of 77 (permalink) Old 02-10-2009, 03:40 PM
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I have 37's with stock 3.73's and a 6 speed. I have plenty of power with the Spartan 250 tune. When I bought the truck (stock), I had 35" mud grapplers on it from the dealer, and before Spartan, the best highway I got was 13.4, and the best I got with the 250 tune was 20.98. Now that I have 37's, the best I've seen is 16.24, all hand calculated. Those three were test tanks (highway, minimal acceleration, etc), and the 37's are an inch wider than the 35's.

I can say that my RPM's are just under 1800 when going 70 now. They were close to 2000 with the 35's. One day I'll add a detroit to the front/rear and regear to 4.10's if anything.

'10 F350, CCLB, SRW, 4x4, 6 speed, 2.5" AutoSpring front leveling pucks, 37 x 13.50 x 18 Toyo's, 18 x 9 XD Diesel's, Road Armors front/rear

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post #10 of 77 (permalink) Old 02-10-2009, 06:02 PM
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its funny how tires made that much of a difference, I would have thought big tires on the highway would have helped by keeping the RPM's lower?? I am putting my stock ones back on a going for a trip so I will keep a eye on my mileage

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