Re: 2003 WJ 4.7 NV247 loss of 4wd
You can not tell that full time 4x4 is gone until you need it. Quite comon for the 247 that the progressive coupler stops working, but it should still work in 4 Lo. The problem can be with the chain inside the T case, or a problem in the front diff. Best is to remove the front prop shaft and try to turn the T case output shaft. If it rotates freely, then most probably the chain is the problem. If it doesnt, then you have to look at the front diff.