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Driveline clunk maintenance..2008

Steve40th396

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Steve40th396 Enthusiast

Steve40th396

Posted
Posted

After reading many threads about the standard Chevy issue driveline clunk, I went about doing the maintenance to stop it.

I took driveshaft out. U Joint strap bolts were tight, but not loctite tight, so that was nice, in 34 degree weather..

The first thing I noticed, the yoke was filthy with black grease/antiseize type crap.

So, being a gun guy, I cleaned the crap out, dried it, used emery in there to take down burrs etc. Then I put a couple piece of rubber to act as cushion, if that really does help. And, Liberally applied Mobil 1 red synthetic grease.

Tightened everything back up. And drove. After 20 miles, stop and go, its very quiet.

Very sad we have to do maintenance on something like this due to poor engineering.

GhostWriter Enthusiast

GhostWriter

Posted
Posted
2 hours ago, Steve40th396 said:

After reading many threads about the standard Chevy issue driveline clunk, I went about doing the maintenance to stop it.

I took driveshaft out. U Joint strap bolts were tight, but not loctite tight, so that was nice, in 34 degree weather..

The first thing I noticed, the yoke was filthy with black grease/antiseize type crap.

So, being a gun guy, I cleaned the crap out, dried it, used emery in there to take down burrs etc. Then I put a couple piece of rubber to act as cushion, if that really does help. And, Liberally applied Mobil 1 red synthetic grease.

Tightened everything back up. And drove. After 20 miles, stop and go, its very quiet.

Very sad we have to do maintenance on something like this due to poor engineering.

What do you drive?  What & where did you apply grease?

GhostWriter Enthusiast

GhostWriter

Posted
Posted
3 minutes ago, Steve40th396 said:

I put Mobil 1 grease inside front yoke that slips into transmission, along with a couple thick pieces of rubber hose.

2008 Silverado 1500 2 wheel drive Z71 Crew Cab

Good to see the clunking went away. 

 

You say there was gunk on the spline.  Does that mean a remedy had already been attempted?

 

If the clunking comes back, may want to replace the yoke.  If memory serves, there's a nickel plated upgrade that is supposed to fix this condition.

Steve40th396 Enthusiast

Steve40th396

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  • Author
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Supposedly its a TSB from gm to grease the inside of the yoke to subdue the clunk. Others have put rubber in there too. I think its to ensure yoke doesnt slam into transmission output shaft. Dont think it ever does. That would be a serious issue gm would have seen years ago.

GhostWriter Enthusiast

GhostWriter

Posted
Posted
7 minutes ago, Steve40th396 said:

Supposedly its a TSB from gm to grease the inside of the yoke to subdue the clunk. Others have put rubber in there too. I think its to ensure yoke doesnt slam into transmission output shaft. Dont think it ever does. That would be a serious issue gm would have seen years ago.

Some have more faith in what GM sees, than others.  Enjoy your clunk-free driving.

Steve40th396 Enthusiast

Steve40th396

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If it comes back, I will regrease it. Simple process. I am not really looking forward to spending money on a plated yoke.

I mean, I can have it plated too. But, if it comes back, I noted the mileage, and I will just do it as necessary.

GhostWriter Enthusiast

GhostWriter

Posted
Posted
34 minutes ago, Steve40th396 said:

If it comes back, I will regrease it. Simple process. I am not really looking forward to spending money on a plated yoke.

I mean, I can have it plated too. But, if it comes back, I noted the mileage, and I will just do it as necessary.

Again, only from memory.........

 

There was worry of the unintended consequences of introducing foreign substances  (such as grease) that could find it's way to the ATF, however unlikely.

GhostWriter Enthusiast

GhostWriter

Posted
Posted
4 minutes ago, Steve40th396 said:

The transfer case yoke you can not use grease.. Mine is attaching into trasnmission, 4l70E

That sounds right.  Thanks for clarifying.

Alan Canfield Enthusiast

Alan Canfield

Posted
Posted

Looks like some folks beat me to the reply about only using ATF to lube the slip yoke.

 

Question about your rubber spacer--what was the dimension of the spacer you inserted?  I'm wondering how much is enough--but not too much--to prevent binding.

Steve40th396 Enthusiast

Steve40th396

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I put a 1x 3/8 piece of fuel line in there.. Just a piece that will act as some bumper effect if the yoke actually ever goes that far, which I honestly dont think it does. I think there is slop in rearend and transmission, and we hear it and feel it. You can move the rearend pretty easily by twisting the driveshaft when on jacks. Now, add 5000 lbs of weight etc. Maybe one day I will mount a go pro down there and watch it.

  • 2 weeks later...
bgbdwlf2500 Enthusiast

bgbdwlf2500

Posted
Posted
On ‎2‎/‎3‎/‎2018 at 2:00 PM, Steve40th396 said:

After reading many threads about the standard Chevy issue driveline clunk, I went about doing the maintenance to stop it.

I took driveshaft out. U Joint strap bolts were tight, but not loctite tight, so that was nice, in 34 degree weather..

The first thing I noticed, the yoke was filthy with black grease/antiseize type crap.

So, being a gun guy, I cleaned the crap out, dried it, used emery in there to take down burrs etc. Then I put a couple piece of rubber to act as cushion, if that really does help. And, Liberally applied Mobil 1 red synthetic grease.

Tightened everything back up. And drove. After 20 miles, stop and go, its very quiet.

Very sad we have to do maintenance on something like this due to poor engineering.

could you avoid the clunk by accelerating slow enough? mine has a bump on acceleration but if I take off slow enough it wont do it and then I can accelerate as hard as I want to. Ive gotten used to it and just accelerate slowly but it is super annoying

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