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iidon147,
As you can see by my signature I have the same engine in the HO version and same 3.73 rear with six speed and 4x4. It pulls great. My set up weighed 22800 on the truck scales and I can pull 6% to 7% grades in 4th at 45 to 50 mph. 52mph is tops for 4th gear. MPG is about 8.5 when working it hard like that. My pin weight is 3000lbs so it is heavy, but still only 22% the trailer weight, which falls within the recommend 20 to 25% mark.
The weight distribution etc is what you need to look at. Good luck.
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