It will fit. I just had the same issue putting a 2007 3.7 V6 in a 2003 Jeep Liberty.
There is a thrust type bearing in the rear of the crankshaft, shat can be removed. Is is installed in some of the Jeep liberty models even if they are automatic transmissions. There are different size snouts on some of the converters. I removed the smaller one and then it worked fine with my transmission converter.
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