Is there any difference in early and late 3.8 engines that would prevent a direct swap?
John

There are... assuming you're referring to the 3.7L V6 used in the Liberty/Cherokee. The 3.8L was in the early JK Wranglers, IIRC.

TwoBobsKJ wrote a good synopsis of an engine swap in a KJ and some of the critical differences across the years. You can swap a different year if you are willing to do some additional surgery on the donor engine.

http://www.jeepkj.com/forum/f202/engine-swap-overview-53270/

_________________
2008 Liberty Sport 4x4 Automatic

Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof Rack
M116A3 Trailer build thread: viewtopic.php?f=72&t=77997

Your assumption is correct. Meant the 3.7 in the KJ Liberty/Cherokee.
Thanks
John