Ok I have. A 1996 jeep cherokee 4.0 ok I just replaced driver side front ujoint because it had a lot of play in it and was clunking bad ...... So after I fixed it i put it in 4wd gose fine down the road sooo I then went to a snow bank to test right when I was starting to climb putting pressure of the front wheels there is just one clunk I did not dare to keep going up ........ Was Thinking the transfer case I hope not

 

Sooo you started climbing a snow bank and you heard a clunk... from somewhere... Did something in the cargo area fall down?

Put the Jeep up on jack stands and starting shaking down the driveline. If one U-joint was bad the rest aren't far behind. Check your drive shaft, double cardan, transfer case, differential, and axles. Also do the same to your steering.

 

Ok I just replaced other ujoint and now if.i put in in 4wd I clunk happens when you turn left or right I herd it's normAl on pavement ????

 

You're using 4WD on dry pavement?

 

I was testing it out first time with 4wd

 

So in this snow storm putt jeep in 4 high still clunking popping and when on the gas I can hear rattling speaking sound

 

When mine did this it was the driver side motor mount.I replaced both.