Drive shaft ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

steppside69 · 04-16-2011, 01:57 PM

Hi all,
I have a 2006 1500 z71 with 5.3 and seem to have a clunk when I take off and when the tranny shifts. I jacked up the rear end and checked the u-joints and there doesn't seem to be any play inthem. What are the chances the the transfer case or the rearend is messed up? The mileage is 80k
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northerngmc · 04-16-2011, 10:14 PM

I have an 04 2500 HD and it has a clunk when starting and stopping, some times!

I did some searching at Dieselplace.com and there the discussion was around the driveshaft where it goes into the back of the transmission or into the transfer case on a 4wd. They suggested pulling the driveshaft out, (first ,marking the location so it goes back in the same way) and clean the splines on the end of the driveshaft and on the output with brake clean. Then to lube the splines back up and put the driveshaft back in. I haven't confirmed yet what to lube it with but I think they were talking about using ATF on 4wd and grease on 2wd. Something about you do not want to get grease into the back of the transfer case.

The theory was that the splines become dirty and rusted and then they do not slide in and out freely, but with a clunk.

I haven't taken the time yet to do this, but it should only take 45 minutes so I will hopefully try it soon.

steppside69 · 04-17-2011, 06:43 AM

I had a 95 GMC 2wd halfton that i had to remove the drive shaft and lube the splines, Worked like a champ.
I will try the atf fluid and see if that works Thanks for the advice
Eric

northerngmc · 04-17-2011, 12:39 PM

Please post what results you get as I am going to try this as well.

steppside69 · 04-17-2011, 04:08 PM

Well I pulled the driveshaft and found very minimal slop in front u-joint, rear u-joint appeared tight with no signs of play.
So I just installed the front u-joint and called it good. Took it for a test drive and it seems to have fixed my clunk, will let you know more info as I put more miles on the truck.
Thanks, Eric
Posted via Mobile Device

04-16-2011, 01:57 PM	#1
steppside69 Registered User Join Date: Apr 2004 Location: Rossford,Ohio Posts: 291	Drive shaft ? Hi all, I have a 2006 1500 z71 with 5.3 and seem to have a clunk when I take off and when the tranny shifts. I jacked up the rear end and checked the u-joints and there doesn't seem to be any play inthem. What are the chances the the transfer case or the rearend is messed up? The mileage is 80k Posted via Mobile Device __________________ 69 chevy stepside (project) 2006 Silverado Z71 Ext. cab 2005 Saturn VUE (wifes dd)

04-16-2011, 10:14 PM	#2
northerngmc Registered User Join Date: Jan 2004 Location: Whitehorse YK Canada Posts: 2,651	Re: Drive shaft ? I have an 04 2500 HD and it has a clunk when starting and stopping, some times! I did some searching at Dieselplace.com and there the discussion was around the driveshaft where it goes into the back of the transmission or into the transfer case on a 4wd. They suggested pulling the driveshaft out, (first ,marking the location so it goes back in the same way) and clean the splines on the end of the driveshaft and on the output with brake clean. Then to lube the splines back up and put the driveshaft back in. I haven't confirmed yet what to lube it with but I think they were talking about using ATF on 4wd and grease on 2wd. Something about you do not want to get grease into the back of the transfer case. The theory was that the splines become dirty and rusted and then they do not slide in and out freely, but with a clunk. I haven't taken the time yet to do this, but it should only take 45 minutes so I will hopefully try it soon. __________________ Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is!

04-17-2011, 06:43 AM	#3
steppside69 Registered User Join Date: Apr 2004 Location: Rossford,Ohio Posts: 291	Re: Drive shaft ? I had a 95 GMC 2wd halfton that i had to remove the drive shaft and lube the splines, Worked like a champ. I will try the atf fluid and see if that works Thanks for the advice Eric __________________ 69 chevy stepside (project) 2006 Silverado Z71 Ext. cab 2005 Saturn VUE (wifes dd)

04-17-2011, 12:39 PM	#4
northerngmc Registered User Join Date: Jan 2004 Location: Whitehorse YK Canada Posts: 2,651	Re: Drive shaft ? Please post what results you get as I am going to try this as well. __________________ Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is!

04-17-2011, 04:08 PM	#5
steppside69 Registered User Join Date: Apr 2004 Location: Rossford,Ohio Posts: 291	Re: Drive shaft ? Well I pulled the driveshaft and found very minimal slop in front u-joint, rear u-joint appeared tight with no signs of play. So I just installed the front u-joint and called it good. Took it for a test drive and it seems to have fixed my clunk, will let you know more info as I put more miles on the truck. Thanks, Eric Posted via Mobile Device __________________ 69 chevy stepside (project) 2006 Silverado Z71 Ext. cab 2005 Saturn VUE (wifes dd)



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