clunk upon acceleration

[99redsilverado]

if its a clunk that can sometimes sound like a chirping of a tire, then its the driveshaft yoke.....get the updated yoke or grease the hell out of yours.....if it goes away, great, if not, then id start looking at rebuilding your rear end.

[sacker_nc]

Originally Posted by KC Chevy Owner

I think I had the same problem, if it sounds like you are getting a chirp when you take off then It is in the transfer case, it almost sounds like your brake pads are sticking though. My 1999 had the same issue and by changing the transfer case fluid to GM recommended Blue Synthetic(not sure of the exact fluid name) this was resolved. Chevy knows about it but it doesn't seem like they want to do anything about is until after the warrenty period is up and then you pay about $15-$18 per quart for the stuff. Hope this helps!! John

Hello, It sounds like you've described the 'groan' or 'chirp' my 2001 Z71 makes (50k miles) after a full stop, then accelerating. From what I've read in the forum, changing the xfer case fluid (using the Blue Synthetic fluid) first might be a good start to getting rid of this noise. Thanks.

[kklagge]

Anyone happen to know the TSB number for the nickle plated slip yoke? I printed out a numbered list but don't see anything that actually says "slip yoke".

Thanks

[01Blackerado]

Did anyoe realize that "Tigga" the original postie didnt ever respond to any of your posts!! thought that was kinda funny, anyway, carry on

[silveradoking]

Sorry, I can't remember the tsb, but the part numbers for the nickel plated yokes are 12477702 for the 1500 series, and 1247704 for the 2500 series.

[suntexan]

I have a 2003 silverado with a 6 inch lift, 3 inch body lift, 315/70/17 tires. Okay I have a CHIRP noise kind of high pitch, this noise is observed when i take off from a stop. It does sound like its coming from the right rear end like the others. ALSO when i pull out of my garage and my back end drops on the slope i hear it then. Sooo what would i check, i thought the transmission mount would fix the problem but no luck, so change to the blue fluid? the nickel yoke? just grease the yoke? HELP Please.

[gmtech79]

If you are getting a clunk on acceleration it is the slip yoke. You can either grease the pooh out of it, inside on the splines or replace it with a nickel plated slip yoke. DO THIS!! It will take care of the noise.

[lweford]

I tend to disagree with the slip yoke theory. I greased and also have installed the reaquetball fix for the slip yoke. This fixed the "clunk" when shifting from park to drive and from drive to reverse. But I still get a sort slip and clunk when I excelerate from a stop. And it feels and sounds like it is coming from the rear diff.