thinking of regearing for towing - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 11-24-2009, 02:37 PM Thread Starter
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thinking of regearing for towing

so i have an 04 F-250 with 35's and stock 3.73's

I have read alot, searched alot, seems a 4.30 gear would get me a little lower than stock. my question is, if im towing a 5th wheel that is regularly 12,000 lbs and in the future maybe near 15,000lbs would i benifit more to jump to a 4.56 instead of the 4.30? I do not plan on running larger tires than the 35's. Im just wondering if i will get more bang for my buck running 4.56's or if that would be too low.

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post #2 of 6 (permalink) Old 11-24-2009, 06:30 PM
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Quote:
Originally Posted by cycojon View Post
so i have an 04 F-250 with 35's and stock 3.73's

I have read alot, searched alot, seems a 4.30 gear would get me a little lower than stock. my question is, if im towing a 5th wheel that is regularly 12,000 lbs and in the future maybe near 15,000lbs would i benifit more to jump to a 4.56 instead of the 4.30? I do not plan on running larger tires than the 35's. Im just wondering if i will get more bang for my buck running 4.56's or if that would be too low.

thanks
The Tow Boss option uses 4:30's. With your 35 in tires, your cruising speed will drop a little, but will help over all mileage. We haul 18K+ regularly with our fleet and the 4:30's work great.
Something to consider; in order to maintain the magic 2K rpm limit, higher gear ratios (more torque) like 4:56 will reduce cruising speed when unloaded.



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post #3 of 6 (permalink) Old 11-26-2009, 01:51 PM
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The towboss with 4:30's drives nice with stock dually wheels, as a friend of mine has that model. Being that your running 35's I would recommend 4:56 ratio gears. Were talking basically changing your driveshaft from turning 1/2 a turn(4:30) to 3/4 a turn(4:56) more for every turn of the wheels. Being you'll be towing fairly heavy, you will want those lower gears especially on hills. Your truck will pull noticably better all around with the 4:56's and 35's. Harry

Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)
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post #4 of 6 (permalink) Old 11-26-2009, 02:32 PM
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Ok I will jump on this wagon also. I have a travel trailer and will more than likely get a toyhauler soon. I have a 4.5 inch lift and 35's on the truck. I drive it unload more than I tow. Should I go 4.11's? I tow the trailers about 5 or 6 times a year.

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post #5 of 6 (permalink) Old 11-27-2009, 04:35 AM
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Heres a site that gives a calculation that may help. Go to the second one down and enter your original tire size and current new larger tire size then your current diff ratio. When you enter the tire sizes put (31.6) or (35), and when you enter your diff ratio just put (3.73) or (4.10) etc.

http://www.4lo.com/4LoCalc.htm

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Last edited by harry6.0; 11-27-2009 at 04:48 AM.
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post #6 of 6 (permalink) Old 11-29-2009, 01:38 PM
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cycojon: I would go with the 4.30s in your situation I believe..

lilgsx: I would def. go w/ the 4.10s in your situation. I run 4.30s and have both 35s and 37s... The 4.30s and 35s work great pulling the camper but I hate running empty with the setup. It puts my rpms higher than I like for just running around. Since you dont pull very often I would do the 4.10s

Aaron - 2004 F350 "Offroad Edition"

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