Transmission problem
1999 Ford F250 Four Wheel Drive Automatic 136K miles
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I have a 1999 Ford F250 S/D 4X4, V10, Automatic with 3.73 gears and a short bed with 136K mileage. I have added a spring in a half on each side in the back already. I just bought a new 5th wheel trailer that weighs 15,500 empty. I have call around to Tran’s shops and ring and pinion shops trying to find out what I need to due to my tuck to beef it up so I am able to pull this kind of weight around with no problems and I get different answers from each person. Can you help me out and clear up some confusion.

Thank you,
Brian Eighmy