I've been trying to track down a grinding noise i'm experiencing when slowing down that (from what i've read here on yt) is likely the driveshaft or the transfer case. Basically, a couple times a week, i'll be decelerating at around 40mph in 3rd or 4th gear and i'll get this terrible, metal on metal grinding noise that seems like it's coming from the front half of the truck. There is no change to the noise if i push in the clutch or shift gears, and the intensity is directly related to my speed, and not the engine speed. However, if i shift into 4hi, i get a loud CLUNK and it goes away. I get this same CLUNK if i just slow down to about 5 mph
, even if i don't shift the t-case. Also, this ONLY happens under deceleration, if i give it any gas at all, even just touching the pedal, it goes away until i let off again. It is NOT the spindle bushings, as i have already greased those. It seems like it would be something in the transfer case, but is this something semi-common? Any ideas what part could be causing this? Also, how can check the driveshaft? I can spin the driveshaft maybe 20 degrees before it stops. Thanks a lot for the help, guys, i really appreciate it!