Front driveshaft shake

I have developed a shake in the whole Jeep at about 65 mph. My first though was the rear u-joints so i replaced them, still shook.
Then I looked the whole front suspension over found a little play in the pass lower balljoint, so i replaced both lowers. Still shook.
So i continued looking it over includeing the boots on the front driveshaft, which were in good shape no cracks at all. in an attempt to isolate the culprit i started removing parts and test driving.
I removed the drivshaft and the shake dissappeared, reinstalled it and it came back.
I cant see anywhere that it may have lost a weight from or any other visible damage.

Is it possible that the joint is bad even thou the boot is still good? This shaft only has right at 40k on it. The original lasted 125k.

*edit*Should also add that the wheels and tires are both new as well as the upper control arms.

Well looks like you found the problem.
Anything that is made by human hands or by a machine can go bad
So while the boots may not be torn / bad something is wrong, you could try a new replacement head on it to see if that would help but....:shrug:

The slight little tear can cause the grease to pour out of the head which will turn the bearings to dust. Can you see visible grease? Does the TC end move freely? Does the diff end plunge without air coming out of the boot? There's quite a few things to check for. If your TC end is bad the shaft can be fixed in about 20-60 mins and for cheap. If it's the other end you are better off replacing the shaft.