Someone who has access to TSB's

[Jersey Tahoe LT]

I found some TSB's that might have the answere to my problem with the Clunk.

Transfer Case - Bump/Clunk Accelerating From a Stop 86-74-03 10/01/98

Transfer Case - Bump/Clunk On Acceleration 99-04-21-004 08/01/99

Driveline - Clunk 99-04-20-002 12/01/99

Transfer Case - Bump/Clunk Update 99-04-21-004A 09/01/01

 

Do any of these involve my truck?

 

1999 Tahoe

 

Later,

Brandon

[robsawatsky]

99-04-20-002A - Useless TSB - basically tells the dealer to do nothing cancels 99-04-20-002.

 

99-04-21-004A - Again useless - tells dealer not to do 99-04-21-004 anymore.

 

Don't have access to 86-74-03 10/01/98 and the others relating to bump/clunk I do have access to aren't applicable to your vehicle.

[Jersey Tahoe LT]

Thanks. Well if anyone else has access let me know.

 

Later,

Brandon

[ace3166]

Those are related to the slip yoke. If you have this problem and want to confirm it, remove your drive shaft and fill the slip yoke 1/2 full with grease and put back in. If the bump/clunk goes away it is the slip yoke.The grease thing was GM's temporary fix. GM has come out with 2 different nickel plated slip yokes part #'s are 12477702 and 12477704. You'll have to check with your dealer on which one is for your vehicle. You will need the model # off the top right hand corner of the RPO label on your glove box door. This place has them for about $75 cheaper than your dealer will.

 

www.gmpartsdirect.com

 

Here is the TSB that supercedes all others.......

 

Clunk, Bump or Squawk when Vehicle Comes to Complete Stop or

Accelerating

from Complete Stop (Replace Rear Drive Shaft Nickel-Plated Slip Yoke)

#01-04-17-004 - (10/05/2001)

Clunk, Bump or Squawk when Vehicle Comes to Complete Stop or

Accelerating

from Complete Stop (Replace Rear Drive Shaft Nickel-Plated Slip Yoke )

1999-2002 Chevrolet and GMC Extended Cab Short Box Pickup Models (Silverado

and Sierra)

 

with 4L60-E (RPO M30) or 4L80-E (RPO MT1) Automatic Transmission and

Automatic 4WD (RPO NP8)

 

Condition

Some customers may comment on a clunk, bump or squawk noise when the

vehicle

comes to a stop or when accelerating from a complete stop.

 

Cause

A slip/stick condition between the transfer case output shaft and the

drive

shaft slip yoke may cause this condition.

 

Correction

Replace the rear drive shaft slip yoke with a new nickel plated slip

yoke,

P/N 12477702 or 12477704 .

[Jersey Tahoe LT]

Thanks Ace. I will try to look at it soon.

 

Later,

Brandon