I have an F150 with 7700# tow capacity. It has the 5L and 3.55 gears. It has the tow package. I am starting to look at for my next TT, and had been looking to stay at or below 5000# dry weight. Howeve...
I have pretty much the same truck. I also have a transmission cooler, which you may have as well. Our TT is round 6500 lbs. My truck has zero problems on the flats, very comfortable. There are some mountain grades that spike the RPM's a bit! I have not had any problems so far. I just take it slow and let the truck/tow mode do the work. I'm certainly at the higher end of my towing capacity.
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