Clunking in 4wd

[Nebraska Mud]

I put my 93xj in 4H and 4L and noticed a loud clunking sound with every revalution of my front drive line. Only does this in four wheel drive. Not sure if it's the drive shaft as there about a quarter inch of play up and down on the u joint. Maybe under load the torque is causing the u joint to slip in and out of the sleeve causing the sound.
I replaced all the u joints in october. No problems til now.

If its the u joint then shouldnt it do the same in 2wd.
Any other Ideas what it could be?

Also the transfer case will grind a little putting it in 4L kinda have to jam it so it does not pop out. Then doesnt want to shift out of 4L and sometimes 4H.

[Kyle]

I would pull the dshaft and take a look at the ujoints replace if necessary and see if that fixes the problem.

And it might be happening in 2wd it just isnt as loud because there isnt as much force on the front ds as there would be in 4wd.

[89xjgrey]

Could also be the cardan joint in the front drive shaft.

[Kyle]

Originally Posted by 89xjgrey

Could also be the cardan joint in the front drive shaft.

That is also a strong possibility, I would just pick up a front shaft from a JY for 30$ and put it in to see if its your problem.

[crawltechxj]

Originally Posted by 89xjgrey

Could also be the cardan joint in the front drive shaft.

x2.....take it off and rotate the cardan by hand..see if it binds at all