there's 6 bolts holding the shaft to the t-case; need 5/16" socket to remove those.
At the diff, there's 2 u-bolt straps, held onto the output with 2 bolts ea, also 5/16" socket.
Remove 'em, remove d-shaft.
Drive it around a couple miles.
If you really wanted, and had access to a grease gun with a needle-point, at the bottom of the d-shaft where it bolts to the t-case, in the cv "cup" there should be a tiny hole. You can put some grease in there.
Or, it's possible the shaft has the cup that's removeable (I had 1 shaft where the "cup" would come right off, 2 that didn't come off). If the cup comes off, you can inspect the CV itself. Chances are all the grease is dry, and the "clunking" is coming from the cv-joint because it's binding up due to lack of lubrication.
The front driveshaft runs about a ~5* angle from t-case to differential.
Halfshafts run a maybe ~1* angle from diff to wheel.
If you remove the shaft, you should also inspect the rubber boot for damage. Because if there's any slight rips, tears, etc, chances are water and other road grime got in there, and grease came out, wearing out the ball bearings.
