I have a project going, and hope someone here has done this before. It is a 91 FSuperduty, Engine is a 7.3 idi. Rear end a Dana 80 with 5.13 gears. Was missing transmission, but I just picked up a BW T19, with 4 something to 1 first gear. Just wondering if anyone else had tried this combo, and their experience with it. I am an Operating Engineer by trade, and intend for this to be my work truck, so interstate speed is not really a priority. oh, almost left out, putting 22.5 semi wheels on it, so according to calculations it should have and effective rear ratio of 3.84. Any thoughts or comments are welcome!!