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2000 Tahoe Downshift Clunk

Mark@wnav-video.com

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Mark@wnav-video.com New Member

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Posted
Posted

Hello,

 

I have 138,000 on my 2000 Tahoe and I'm getting a rather noticeable and irritating clunk when slowing to a stop. It happens when the transmission shifts from 2nd to 1st I believe. It is happens all the time unless I have the truck in 4 wheel drive. Unfortunately my GM mechanic buddy miss-diagnosed the problem as a worn Spider Gear Set and after a $500 repair its still doing the exact same thing. There is also a loud clunk when shifting into Reverse from Park or Nuetral. (No noise when shifting into Drive)

Advice much appreciated.

scottydawg Enthusiast

scottydawg

Posted
Posted
After digging a little deeper I found information that suggests my problem might be the slip yoke? Some say they grease this and the clunk goes away. Any thoughts on that?

 

Again, much appreciated

 

Can't hurt, and could be, if the slip joint is hanging up any suspension travel (like coming to a stop etc) would cause a clunk/judder noise, but going into 4wd wouldn't make it go away...

 

Do you notice it at any other time at any other speeds? If you do, I would say it might be u-joints. If not, I am surprised your friend said spider gears, because with worn spider gears it would also happen all the time, not just on downshifts.

 

If not u-joints I would think it points to something internal in the transmission. Have you gone through the tech wiki for TSBs?

Mark@wnav-video.com New Member

[email protected]

Posted
  • Author
Posted
After digging a little deeper I found information that suggests my problem might be the slip yoke? Some say they grease this and the clunk goes away. Any thoughts on that?

 

Again, much appreciated

 

Can't hurt, and could be, if the slip joint is hanging up any suspension travel (like coming to a stop etc) would cause a clunk/judder noise, but going into 4wd wouldn't make it go away...

 

Do you notice it at any other time at any other speeds? If you do, I would say it might be u-joints. If not, I am surprised your friend said spider gears, because with worn spider gears it would also happen all the time, not just on downshifts.

 

If not u-joints I would think it points to something internal in the transmission. Have you gone through the tech wiki for TSBs?

 

 

I have not used the tech wiki, new to this site so will check that out. I did find out information that if it was the slip yoke it would only do it when coming to a stop and taking off from a stop and not while shifting. So, it appears thats not it. It does not do the "clunk" at any other time, only when slowing down and the truck downsifts from 2 to 1. A neighbor who is a diesel mechanic listened to it today and is pretty sure it is in the tranny. (not the best news I guess) I'm not sure what to try next, perhaps take it somewhere and hope for the best. Thank you for your help.

Mark@wnav-video.com New Member

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Walleye Mark, do you have a rivalry with Walleye Dan? :dunno:

 

Luckily there are enough walleyes for all of us! I wouldn't mind trading some tips with Walleye Dan though. I'm just worried about getting my boat to the lake ramp with this dreaded clunk.

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