Only problem with the 4.0s is that they are GUTLESS as heck!! My 2003 Rubicon (auto trans) is a DOG on freeway hills (Interstate 5 Grapevine, and Siskiyous), and that's with stock sized tires (245/75/16) and factory 4.10 gears. Constantly downshifting and revving up way too high for a straight 6!!! I guess I am too spoiled with the 401 v8 in my older CJ5.
