Couldn't watch the video for some reason but to me from what you described it sounds like a u-joint.

 

Ok, I changed the code so hopefully you'll be able to view the video now. If someone knows how to properly embed a video please let me know!

I had an idea of it being the U-Joint, but I'd rather have the more experienced members of the forum point me in the right direction.

 

have you checked your slip yolk?

 

No I have not. Honestly I have no idea what that is. I'll have to do some research. I'm most definitely a rookie when it comes to this.

Has anyone been able to view the video?


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Video works now, that is weird to me so I'll leave the real answering for the more experienced guys. But a slip yoke is the portion of the drive shaft that inserts into the transfer case, it basically allows the driveshaft to slide during flexing of the suspension etc etc.

Edit: Have you checked the driveshaft and or u-joints for play? Try to wiggle them, And push on the portion of the driveshaft that goes into the transfer case ( the end with the slip yoke ) if it wobbles then I'd say the bushing surrounding the shaft could be bad.

 

Edit: Have you checked the driveshaft and or u-joints for play? Try to wiggle them, And push on the portion of the driveshaft that goes into the transfer case ( the end with the slip yoke ) if it wobbles then I'd say the bushing surrounding the shaft could be bad.

I had my father take a look at it a few days ago and I remember him saying the driveshaft does have a little play in it. I'll check out your ideas tomorrow and see where that leads me.




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My truck was doing the same kind of thing only not as bad, turned out the transfer case had no aft in it. dealer replaced t-case and no problems so far.

 

That's what I was "hoping" the issue was. Already changed the transfer case and transmission fluid.


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Id start by greasing the slip yolk and go form there. Hope you get it figured out.

 

Thank you very much. I'll keep the thread updated.


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Follow these steps and you can do it yourself in the driveway!

For one piece driveshaft only!
(If you have a two piece driveshaft, you should replace the carrier bearing as well!)

1. Set parking brake (very important!)
2. Place Chalk blocks under rear tires (2x4's work fine)
3. Make sure parking brake is set!
4. Is parking brake set?
5. Use a paint pen to mark the rear u-joint position (at rear differential) before you remove the two clamps. You will need this mark to reference so you put it back in the same position it was when you removed it! Remove the four bolts holding the u-joint to the rear differential yoke.
6. Place a pry bar between the u-joint and diff yoke to seperate the driveshaft from the yoke. Note: If you forget to set the parkiing brake, your truck will roll if not on level ground!
7. Lower the driveshaft and pull towards the rear of the truck so it will come out of the transfer case. This is where the 'Clunk' occurs!
8. Clean the splines on the driveshaft w/ brake kleen, wipe it down good, lube liberally with some grease (Lucas Red) and put it all back together! DO NOT spray Break Kleen on the shaft in the transfer case! Just wipe that part off with a clean rag.

Most importantly! Don't forget to pick up a 12 pack of Yuengling Lager! You will need this to finish up the job! You can figure that out for yourself... nuff said!

 

This was very informative! Thank you very much. I'll do this in the morning and see where that leaves me.


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My teachers ford had a lot of driveshaft play when he went from drive to reverse. He said his rear diff was toast.

My truck makes a clunk from time to time when going into reverse or drive after it sits or is an uphill or downhill position. I started a thread and several people said it was common and perfectly okay.


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Slip YOKE. Grease that. It is very easy to do yourself or a shop will do it for about $75. Check your u-joints for any play.

Now, there is a clunk sometimes going into Park that is loud but it is just the parking prawl locking into position and is a normal function of an Allison transmission.

 

Any updates, Klaassen09? We hope you were able to get the clunk narrowed down today!

Sarah (assisting Kelly)
GM Customer Care

 

Don't know if this is the same, but my truck 2008 GMC stock started making a loud clunk only when shifting to reverse and not all the time. Dealer inspected and said rear end. After taking rear end apart they found nothing wrong and then checked the T case and found a broken snap ring, which tore up the shift fork and some gears. Dealer is repairing and should get it back this weekend. Sorry for the long post, hopefully this helps.

 

Alright so I was finally able to attempt fixing the issue yesterday. I took the truck to my buddy at the GM House here in town.
We greased the slip yoke and inspected the U Joints for anything out of the ordinary. U Joints were in good shape and the new application of grease did not fix the clunking noise.
We believe that I have some chain slack in my transfer case.

 

Ttt.... Mine is doing the same thing.

 

Case is pretty easy and straight forward to rebuild, nothing too scary in there. A new chain is not cheap but not horribly expensive. If your reasonably handy with a wrench and can follow directions you can have the whole thing done in an afternoon (save the beer for after the case is back in the truck)

I've done a few of the older cases, I don't think the ones in the LMM's are too much different but you should look up a manual for it.