watafuh is wrong with my blazer?i need help

[Yuba K5]

/forums/images/graemlins/angryfire.gifmy blazer went to making a knocking sound like there was a rock stuck in the tire yesterday.i went to the shop,jacked up the ass end,and it was hanging up at a curtain spot on the rotation of the tire.not the driveshaft so i was thinking maybee i had broken a tooth off the ring gear in the rear end. since it was just nocking a little i tryed to drive home,and it got worse fast and was hitting real hard. i figured it was the rearend and limped it back to the shop.when i unhooked the driveshaft from the t case the rearend was spinging fine.also the nocking stops when i let off the gas,and deosnt make a sound in reverse.so it isnt the rearend could this be my transmission or tcase?i have an sm465 205tcase.any info would be appriciated. /forums/images/graemlins/1zhelp.gif

 

[Tweetysuarus]

Can't really help ya it almost sounds likeU-Joints or Xfer case issue? /forums/images/graemlins/confused.gif...........But O/T Do you guys still wheel down at Shad Pad at the river bottoms?
Bill

 

[anatomiczero]

Transfer case mounts bad or need to be shimmed? My truck nocked in 4WD because the transfer case was hitting the crossmember from rotating. Not sure if that's it, but something to look at.