I just bought a 2005 TJ X. Stock (it is beautiful by the way; 88,000 miles and excellent condition - got new tires and mechanic asked if it had ever been out of a garage). 4x4 light won't come on, but 4x4 is working. I've seen multiple videos and threads about replacing the transfer case switch. But am seeing both a transfer case switch mode (part J8134473) and a transfer case switch (part 5083138AA). It is a model 231. Which do I need?