If you're looking for a project, buy a Liberty with a blown engine and throw a Cummins 4B into it. I heard of lots of guys that put them into Jeep Wranglers, so I would imagine they would fit. FYI, the 4B (also known as 4BT) is a four cylinder version of the more-popular 5.9L (6.7L after 2007) Cummins, with many of the same parts. Prior to 2007 it was 3.9L, now it's 4.5L. Two things, though, I'm not sure of: 1) Whether the stock tranny can take the torque, 2) the engine is just at tall as the 5.9L/6.7L engine so it might be tricky getting the inline 4 engine under the hood.
There...now I've made yet another attempt at spending someone else's time and money
