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Driveline clunk in 99 Tahoe

desertman

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desertman New Member

desertman

Posted
Posted

Has anyone expereince this (1999 4 wheel drive Tahoe)

Accelerating gradually from a stop, the truck begins to move forward a few feet and then I hear a clunk like there was slack in the drivetrain. The truck keeps moving forward and doesn't make the clunk until I stop again.

 

Sometimes the clunck occurs as the truck comes to a stop also.

 

If I accelerate hard from a stop the clunck occurs immediately as the truck moves forward. The sound and feel is the same asaccelerating gradually.

 

I decribed this to a follow Chevy truck ower who said it sounded like a problem he had. He said the dealer adjusted or replaced the thrust washer, but it did not fix the problem.

 

Any ideas on what is causing this. The most unusual thing is that the truck will start to accelerate forward like everything is nice and tight and then "clunck" while its moving. I checked the drive shafts and universal joints and they appear to be tight.

Shaners Senior Enthusiast

Shaners

Posted
Posted

It sounds like the slip yoke problem alot of people are having.  There is a TSB to replace it with a "nickle plated" slip yoke.  If you still have some warranty left then GM will foot the bill.

 

I've also heard of people removing the shaft and greasing the yoke and putting a "superball" in the hole before they reinstalled it.  I don't know if that is a good idea or not though...

 

Just greasing the splines should help for awhile...

CacalackChuck Enthusiast

CacalackChuck

Posted
Posted
I've also heard of folks remedying this problem by replacing their transfer case fluid with the newer Autotrack II fluid (blue stuff).  I've got the "clunk" problem too on my '99 tahoe as well.  Going to replace the TC fluid this weekend.  I'll let you know how it works out...
debo4x4 Enthusiast

debo4x4

Posted
Posted
I just got mu truck back yesterday with the same probelm and the dealer greased the yoke and replaced the u-joints. the problem is gone now...
99silveradoz71 Senior Enthusiast

99silveradoz71

Posted
Posted
I've had the lube, the blue juice, and the nickel yoke put in mine and she's quiet now...thankfully.  The spline grease job would work for a while it seemed, then come back.
JRod Enthusiast

JRod

Posted
Posted

Hey folks, Jared here...

 

Anyone know the part number on that "nickle plated" slip yoke?  I'd rather not hassle with the parts guy at GM ... must easier if I had a number.  Thanks!

 

j

CacalackChuck Enthusiast

CacalackChuck

Posted
Posted

Yoke P/N 12477702 (1500 Series) or 12477704 (2500 Series).

 

Hope this helps.  Let me know if this works out for you.  I got the Autotrak II TC fluid put in today for the same problem.  Hopefully this will fix it.

RyanbabZ71 Senior Enthusiast

RyanbabZ71

Posted
Posted
I had the fluid changed didnt help (it did for a bit)
CacalackChuck Enthusiast

CacalackChuck

Posted
Posted
FYI...Got my truck back from the dealership yesterday (had the Autotrak II fluid added) and drove it really hard for about an hour.  Seems to have solved the 'clunk' problem.  If this doesn't last, the mechanic suggested the new slip yoke.  Hopefully I won't have to resort to that, but at least I know what's required down the road...

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