Take out the drive shaft and put a bunch of moly based grease inside the yoke(the part that slides into the trans)
I had the same problem and that fixed it, for now.

 

But mine is a 2wd.

 

There is also a TSB out that completely replaces the yolk with a new design that fixes that problem.

 

i already did the grease trick, worked for about a week <img border="0" title="" alt="[Frown]" src="gr_sad.gif" /> . Anyone have the part number for the new design yoke?

thanks

nitin

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Ws6Luvr:
<strong> correct me if i'm wrong, but i'm sure GM would have fixed a problem like this following 2000....</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Bwhahahahaha! Thanks for the laugh Nitin. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

GM/Chevy had replaced my front u-joint/slip yoke when I originally complained about this problem. They also did something to the rear but didn't replace it as I had asked them to. I knew the problem was based in the rear u-joint but they didn't see it that way. Truck was fine for about 2 weeks after they worked on it.

Brought it back one month later for the same problem and told them to make sure they REALLY checked the rear u-joint, as I was sure it needed replacment. All they did was greased it. It was quiet for 2 weeks again and then went back to it's old tricks.

Same thing probably that you are experiencing. Coming to a stop or taking off slow from a start there feels like there is a moment when there is excessive slack/slipping/grabbing and then it goes. Coming to a stop feels like the whole back end moves up/down just a bit.

I can always just keep re-lubing it myself, but I would really like them to replace the stupid thing before the warranty goes out. Mine is a 2000 Z71 as well, and yes, there is a shitload of slack in the entire driveline.

 

http://service.gm.com/gmtechlink/arcv_pdf/12_01_e.pdf

Go to page 8 and it is the first bulletin under "Driveline Axle".

01-04-17-004; Clunk, Bump or Squawk
when Vehicle Comes to Complete Stop
or Accelerating from Complete Stop
(Replace Rear Drive Shaft Nickel-Plated
Slip Yoke); 1999-2002 Chevrolet and
GMC Extended Cab Short Box Pickup
Models with 4L60-E (RPO M30) or 4L80-
E (RPO MT1) Automatic Transmission
and Automatic 4WD (RPO NP8)

 

I had the same problem. Put in spicer u-joints and put molly grease on the inside of the yoke. I still have the problem now about 1-2 months after but it is a more dull clunk. Not the hard snap it was.

So whats a part number for the new yoke? If I can buy one in the next week I'll put it on and tell everyone how it works.

 

Just got my truck back from a dealer up here in Columbus. Took in for same problem, (plus a blown speaker, tail lights bulbs were melting in housing, and front suspension noise and vibrations, anyways) Said they had a kit they were using for the yoke. But they could not perform my warranty because of ay 2" shackles I put on the summer? Wrong alignment! What ever?!? I will just pack some grease in myself.
Also not to change the subject, but they wanted to charge $200+ to up date miles on my new gauge cluster, it would take 3 to 4 days. Ya right! Dealerships, they get you any way they can!

<small>[ January 28, 2003, 09:39 PM: Message edited by: 02Silverado ]</small>

 

Mine is a 2000 and had the same problem bad. I had new gears and carrier installed and now it is totally fixed? I bought new ujoints too but now I don't need them. It used to do it every time I came to a complete stop, but now I can slam the brakes hard is it doesn't do it. Weird. One of the carrier bearing races was scratched up but I doubt that would cause it. Perhaps something in the differential slowly wears and goes out of alignment just enough to cause this clunking.