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Just looked up the tire size on my 275/65-20. I'm a 34"? Tape measure with it loaded in the garage says it's 33.25" on the front at about 50% tread on a Firestone Transforce II tire. I like the Firestones but they aren't wearing the best. I think I paid $500 for the set of tires/wheels off a newer truck though so I'm not bitching at all.
It'd be kind of fun to find a set of 275/55-20 and tow with those. I bet those would increase towing performance pretty significantly?
What's your likely use of your truck Anthony? Just towing a single car trailer with a Jeep, you'll be fine with 37" tires if you wanted. (assuming you have the 4.10 or 4.30 gears)
I couldn't find a quick 2005 brochure but I've attached the 2006 and 2007 brochures to this post. (not sure how those will show up but....)
Here's a paste from the 2007 brochure about available axle ratios.
View attachment 145731Looks like Ford rates the 2007 to 12,500 lbs or 12,500 lbs for conventional towing. My truck is right at 7200 lbs and that's with my fat ass in it (I think). Let's just say yours is 7k with no passengers and you're at 12,500. You're able to tow just under 20k per the brochure for 2007 from the bumper.
5th wheel towing is interesting. With a gooseneck or fifth wheel, at worst you're rated @ 14k. That's a load in my experience. You'll be at 6.5-7 mpg towing but it'll do the job pretty well. 4.30 gears get you another ton or so of weight available to tow. I'm honestly impressed with how much weight the Super Duty chassis can tow pretty safely. (probably any modern truck for that matter) 14k is not a joke at all. Emergency maneuvers are much better than they have a right to be in my truck. (have I mentioned I love the integrated brake controller?)
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Edit: This might be worth your time to find for your year of truck? (the Ford_Linc_10RVTTowGuide.pdf)