I have a 1990 F-250, 7.3 (about to be 6.9 due to engine swap), E4OD, Supercab, 2wd, 3.55 gears and I'm trying to find the maximum towing capacity. (I would also be interested in a combination of ZF5 and/or 4.10 gears, I could do those swaps if worth it). I've searched the forums a bit and really what I'd like to see is a page from the owners manual that contains this information, if anyone has the diesel supplement available. Additionally, does anyone know if Ford had different weights for towing combinations? (bumper pull vs. 5th?) Did Ford publish a pin weight or tongue weight? I bought the truck to be able to pull a travel trailer, now I need to know what my capabilities are so I don't buy too much trailer. I fully understand from reading the forums that some of you guys have moved mountains with your IDI's; however, I'm looking for the capacity that Ford said it was good for. I'm planning on picking up a diesel supplement owners manual in the near future, I'm just nickle an diming an engine swap and it's all adding up to the point Mama's threatening I have to sell some of my other toys!