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86 Posts
I tow a 13,500 lbs 5TH wheel with my 05 6.0 XLT 4X4. No mods and so far no problems (Knock on wood). It seems to tow my 5ver very well but I never owned a 7.3 to compare with. I have not done any significant climbing yet but so far seems to have plenty of power once I get past the turbo lag. I actually have to watch my speed on the freeway. I'm Also considering installing 4:10 gears.