Okay, with everything you've mentioned in your post, you will also need the rear end ratio and GVWR...... Then you can find the precise manufacturer's rated towing capacity. I've used thecartowing.com.....just use your year, model, format, etc....seems the only Rear end is 3.73, unless that's been changed. Also, acdii is correct that aftermarket lift and wheels/tire very much affect towing capacity and dynamics, and usually *not* in a good way. Looks like your truck would have been gonna be between 14500 and 14900, before any modifications......YMMV
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