Here's my pickup. '93 Dodge D-350, Cummins, 5 speed, 2wd, 4.10 rearend, 165k miles. Fuel pin is as deep as it'll go, and the starscrew is cranked 2 1/4 turns. It runs pretty good now. Now I wanna change it to a 3.54 rearend and I think I can get over 25mpg with it