I have a 99 lifted 3.5" with rough country lift . I got a vibration after lifting it. I dropped the tc and that helped but still vibrated. I got a yoke and did a hack & tap, 4 degree tapers under springs.and put the front shaft on the rear and put the tc back up. Now it vibrates worse than ever.Very disheartening. It has new u joints already. What the heck is happening?

 

try indexing your driveshaft?

 

i have a 6.5" lift and still have the stock DS...i havent done my HNT yet....been up to 50-60 with very little vibes......was it a pain to replace the U-joints in that shaft?? what about the ball in the middle?

 

is that an sye or hack and tap? how long did you drive it with the stock rear shaft and have the vibe?

 

apparently that is the centering ball. i am waiting on my sye and i need to change universals in the front shaft im going to use. i too was curious about the centering ball.

 

I'm not familiar with that. How do you do that?

 

It's a H&T. The vibs before doing it were slight and only under load between 35-45 mph with the old drive shaft. I installed new universal joints before instlling the front shaft to the rear. I noticed that after replacing them if you held the shaft and pushed the CV joint from one side to the other it would get stiff when reaching center\straight. Is that normal?

 

it works on helicopters im not sure if its the same for jeeps. when you get a vibe you unbolt the drive shaft and turn it 180 and bolt it back up. its for weight balance. another thought being that your shaft may be out of balance.

 

First, your drive shaft looks to be a bit long with little to no room for it to collapse.

Second,
A better pic from the side would help.

 

X2 3.5" isnt very much to have a SYE........at that hight you may need to have it shortened a Inch or lift the jeep higher......

 

I thought the same thing at first but measuring the distance and comparing to the front it's exactly the same @ 31.5" I'll try flipping the shaft to see what happens.

I tried to get a better pic but the camera isn't wide enough angle lens. Maybe I can bum a different camera.

 

http://www.4xshaft.com/index.html

Tons of great info there.