I got it fixed!!! the noise was driving me nuts! anyway the noise was coming from the slip yoke on the drive shaft.
Step 1 Go to GM dealership and get Special Lube Part # 12345718
Step 2 Index and remove drive shaft (index so you don't get any vibrations)
Step 3 Lube the spines of the yoke where it goes into trans or transfer case
use a generous amount on the splines don't put any on the outside of
the yoke.
Step 4 Clean the seal surface of the yoke so you don't ruin the seal
Step 5 Re-install the drive shaft and torque the bolts to serv man spec. (don't
forget to put it in the same way it came out.
the whole job took about 15 minutes and was very easy to do and the noise is completely gone. If you have any ?'s you can e-mail me at
intruder8000@juno.com