For the most part the 3.7 in any Chrysler product was the same 2005-2012. Even the Mitsubishi raider of the same era had a 3.7 Chrysler.
The block and heads have a few internal changes for stuff like oil flow and the ground points are better designed on the newer blocks but it's all just about the same far as bolt up is concerned .
For our 06 commander we got a low mileage 3.7 from a 2012 liberty, a few sensors to swap and the oil pan. Very straight forward just use your intake and exhaust manifolds. I think 2007-08 they add EGR valves, don't worry about that, just use your original exhaust manifolds since they don't have the passage ways for EGR and it's all good.
The junkyard Hollander interchange is wrong about which years are usable, its mostly just swapping a couple of sensors, the oil pan to be correct for the commander. Oh, the oil filter changes late 2008 or 9, I just use the filter that matches the year of the new motor. Minor stuff really.
There are a few tips on the swap for the commander, the factory Service manual
skips a few steps and misses a few tricks. Most time consuming part for me was getting the exhaust bolts to the down pipe off, the nifty self locking nuts Chrysler used spun freely and were difficult to access to put a wrench on . Over all of a lot of work as you'd expect but not a job I'd shy away from.
BTW twoBobs knows his stuff on this motor, if in doubt listen to him.
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