Originally Posted by 91XJTim
really just depends on the setup your going for. For an ultimate wheeler some say 4.0 for a driver/weekend warrior some say 2.5. Id say go 4.0 alot of people say they wish they would have gotten the 4.0 > 2.5.. Both motors are bullet proof just dpends on the driver really. So the next question is, what is the jeep going to be used for?
I've never heard anyone refer to the 2.5 as "bulletproof", but I have seen a lot of jeeps with blown 2.5's, or recently replaced ones. Go with the 4.0 hands down, more power, torque, reliability, and easier/better to modify.