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Old 03-29-2011, 10:49 AM   #31
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Thread hijack -- about the tire/rim size effect on towing:
One of the big impacts of changing to a larger rim/tire from OEM is the affect on final drive ratio. See Tire Size Vs. Gear Ratio - A Formula
Whenever larger-than-stock tires are installed on a truck, it will have a direct effect on the truck's performance. Why? It has to do with the effective gear ratio. Your truck comes from the factory with the optimum axle gear ratio to work with the truck's engine, transmission, and stock tire combination as well as provide a good balance between acceleration and fuel economy. When taller tires are installed on a truck but the axle ratios stay the same; the effective gear ratio is reduced. This means the engine is forced to operate below its power band, and performance and fuel economy suffer as a result
The reverse is also true when reducing the overall rim/tire size


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Old 03-29-2011, 01:06 PM   #32
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Just for info I tow the 8313 with a silverado 5.3 with a 3.73 rear end. It also has the heavy duty tow package from the factory. Mine is a 99 and it tows nice. I tow 60 MPH and have been to florida and back and to south carolina and back a couple of times. No problems yet. get 10MG towing 21 when not

Bill And Theresa Perry, At Lake Gaston
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2003 F 150 Super crew with 5.4 Tow package
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Old 03-29-2011, 04:46 PM   #33
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MY 2010 F 150 supercab, 5.4 ,4x2, 3.55 limited slip. Is rated on the ford towing guide as 9800 lbs for a 5th wheel or travel trailer. It towed fine empty 250 miles from muskegon to st. clair ,mi last fall after purchase. The trailer is a 26 foot Puma rlss, supposedly 6,300 lbs dry, i used a draw tight weight distributing hitch and have recently bought a equalizer 12,000 lb hitch ...wish me luck
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Old 03-29-2011, 05:13 PM   #34
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Originally Posted by caleb View Post
Not necessarily. That's a case by case basis, determined by the rims. Check out the 22" Alcoas, that blows your statement out of the water. Most trucks are coming with 18" rims, so you're saying if you dropped them down to a 15" or 16" rim my towing capacity would simply go up? Not true.
Ford's towing guide for F-150's states;
Reduce GCWR and Maximum Trailer Weight by 500 lbs. on models with 18" or 20" wheels.
So the truck's capacities doesn't go up, but the larger rims will reduce the truck's capacities.

Gary & Trish
"PT Crew Member Since 11/2010"
2017 Prime Time Crusader 315RST TE 6.0 : 2007 Flagstaff 206ST MAC Series
2012 F-250 Lariat : FX4 : CC : SB : 6.7L Diesel : 3/55 Gears

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Old 04-05-2011, 04:16 PM   #35
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I have travelled to Florida from Ottawa On for 6 years now. 6 x 2500ks x 2 or about 30,000 kms. The first two years I hauled a 30 ft Pegasus with dry weight just over 6000 lbs. I used a 2002 GMC 1500 Z71 4x4 with 5.3 engine and 4.73 rear end. The two years I hauled a 33ft Flagstaff Signature ultra light with the 2002. I am now hauling with a 2009 CHev LT Z71 4x4 with 5.3l engine and 3.42 rear end. Yes, it is a little hard on it and I fill up every 300 kms. B U T I don't have to pay the extra gas that a 2500 HD with 6.0L engine would cost me for the other 11 1/2 months. My dry weight is about 6372 lbs. I will not go any heavier. With the '09 I go about 102km per hr. I also try to keep it in tow mode as often as I can.

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