hello all just joined, ok so i can say i had a 2001 2500 5.9 gasser with 4.10 and it was a 4x4 with stock size tires it was a big difference from the 5.2 1500 i had, it run 1900rpms @ 60mph and got about 13-14mpg, BUT then i got a 97 2500 v10 5 speed 4x4 and 3.54s w/ dana 80, i like it better and turns less rpms and has great power, just got a SCT 93 tune from Flyan Ryan and it woke it up tremendously. the 01 was fun to drive too and it was an automatic with rear disk it was hard to sale it but didnt need 2 2500s. hope this helps.