When I went to pick up the third starter today, the girl working noticed something odd about the part numbers. When she looked up the 2003 2.4L liberty, it listed a 17839 for the standard, but DLG17882 for the gold. She said the gold part number is always the same as the standard, but with DLG on the front. She ended up pulling up the info for the 17882, and it said it was compatible with 2002-2006, but the 17839 was only for 2002-2003 for some reason. They did have the 17882 on hand, so we gave it a shot, and my jeep starts fine now. There are very slight differences in the casting, but nothing that I would think would make a difference. So, at this point I don't know if it was that it was the wrong starter, or a bad batch of the 17839 or something.