How's it going? I'm new on this site and i'm about to be the proud owner of my first diesel. Bought me a 2000 Excursion V10, waiting till i pcs to swap in a 12 valve Cummins. just got a few questions. i am not interested in making gobs of power, i just want to get the best fuel mileage out of it as i can, but whatever power i make along the way is fine by me. should i keep the factory 4.10's in the rear or should i put in 3.73's? also the 4r100 should handle the torque if i put in a performance torque converter and valve body right? and another thing, what am i to do about exhaust, i mean, am i gonna have a cummins (dodge) exhaust coming out of the turbo and a super duty exhaust welded to it? or is there a company that i am not aware of that sells this setup? i appreciate any assistance in this matter fellow bombers.