Whenever I take off or stop, I get a barking sound and a very small jolt. It's obviously related to how hard I accelerate or brake. And it does it EVERY time I take off. It's just that how loudly it does it and when it does it is related to how hard I run it. Take off slowly, and it'll do it on the 1-2 shift. Take off decently hard at all and it's on the takeoff. Any ideas? My wife thinks it's the bed squeaking, but I don't see how. I just have no friggin' idea. The truck is used and has done it since I bought it a month or so ago. But it's not the steering shaft squeal, because I can feel that in the steering wheel when it occasionally hits my header. This isn't it.

 

It's probably the slipyoke binding. There is a TSB for a nickel-plated slip yoke that's available to fix the problem. GM also has special formulated lubricant for it.

 

got a part number? and isn't there an aftermarket yoke that fits? thanks!

 

Sorry, no. I don't have those numbers. This was a problem that early NBS trucks had.

 

Here ya go boyz, done this so manay times....it seems to be a regualr.

Subject: Clunk, Bump or Squawk when Vehicle Comes to Complete Stop or Accelerating from Complete Stop or Accelerating from Complete Stop (Replace Rear Drive Shaft Nickel-Plated Slip Yoke) #01-04-17-004B - (01/05/2005)



Models: 1999-2000 Cadillac Escalade (Old Style)

2002-2004 Cadillac Escalade, Escalade EXT

2003-2004 Cadillac Escalade ESV

1996-1999 Chevrolet 1500 Series Extended Cab Short Box Pickup (Old Style)

1996-1999 Chevrolet 1500 Series Regular Cab Pickup and Utility Models (Old Style)

1999-2002 Chevrolet Silverado Extended Cab Short Box (New Style)

1999-2004 Chevrolet Silverado 1500 Series Regular Cab (New Style)

2000-2004 Chevrolet 1500 Series Avalanche, Suburban and Tahoe

2001-2004 Chevrolet Silverado 2500/3500 Series Regular Cab with Long Bed or Extended Cab (New Style)

2001-2004 Chevrolet Silverado 2500 Series Crew Cab, Short Box (New Style)

1996-1999 GMC 1500 Series Extended Cab Short Box Pickup (Old Style)

1996-1999 GMC 1500 Series Regular Cab Pickup and Utility Models (Old Style)

1999-2002 GMC Sierra Extended Cab Short Box (New Style)

1999-2004 GMC Sierra 1500 Series Regular Cab (New Style)

2000-2004 GMC 1500 Series Yukon, Yukon XL

2001-2004 GMC Sierra 2500/3500 Series Regular Cab with Long Bed or Extended Cab (New Style)

2001-2004 GMC Sierra 2500 Series Crew Cab, Short Box (New Style)

2003-2005 HUMMER H2

with Four Wheel Drive (4WD) or All Wheel Drive (AWD) and One-Piece Propeller Shaft ONLY




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This bulletin is being revised to add Cadillac Escalade (Old Style) and HUMMER H2 to the Models section. Please discard Corporate Bulletin Number 01-04-17-004A (Section 04 -- Driveline/Axle).


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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 driveshaft slip yoke may cause this condition.

Diagnostic Tips
There are several resources in the electronic Service Information System which can provide the technician with information on diagnosis and repair of clunk conditions, and fix the customer's vehicle right the first time without unnecessary parts replacement. Some of the documents available in SI include:

• Symptoms - Propeller Shaft (SI Document ID #697266)

• Knock or Clunk Noise (SI Document ID #697290)

• Rear Drive Axle Noises (SI Document ID #700580)

• Launch Shudder/Vibration on Acceleration (Replace Propeller Shaft and Install a New Pinion Flange/Seal), Bulletin #02-04-17-001

• Information on 2-3 Upshift or 3-2 Downshift Clunk Noise, Bulletin #01-07-30-042

• Driveline Clunk When Stopping (Reprogram Powertrain Control Module (PCM), Bulletin #03-07-30-028

Correction
Replace the rear drive shaft slip yoke with a new nickel-plated slip yoke. See the parts table below.

Follow the service procedure below.

Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information (SI Document ID #349918).
Reference mark the propeller shaft to the pinion flange connection.
Important: Do not pound on the propeller shaft yoke ears. Never pry or place any tool between a yoke and a universal joint.

Remove the bolts and the yoke retainers from the pinion flange.
Slide the propeller shaft forward and out of the rear pinion flange.
Lower the rear of the propeller shaft and pull the driveshaft out of the transfer case.
Notice: Never clamp propeller shaft tubing in a vise. Clamping could dent or deform the tube causing an imbalance or unsafe condition. Always clamp on one of the yokes and support the shaft horizontally. Avoid damaging the slip yoke sealing surface. Nicks may damage the bushing or cut the lip seal.

Support the propeller shaft in a line horizontal with the table of a press.
Important: Remove the front slip yoke and the universal joint together. The new nickel-plated slip yoke comes with a new universal joint.

Disassemble the snap rings by pinching the ends together with a pair of pliers.
If the ring does not readily snap out of the groove in the yoke, tap the end of the cup lightly in order to relieve the pressure from the ring.

If the retainer is difficult to seat, the yoke can be sprung slightly with a firm blow from a soft-faced dead blow hammer.
It may be necessary to lubricate the snap ring with a slight amount of chassis grease so that the snap ring seats in the bearing cup groove.
Install the slip yoke onto the output shaft in the transfer case.
Align the reference marks on the pinion flange and the propeller shaft.
Install the yoke retainers and bolts.
Tighten
Tighten the yoke retainer bolts to 25 N·m (19 lb ft).

Lower the vehicle.
Parts Information
Part Number
Description
Usage

12477702
Yoke Asm., Prop Shf Slip (with u-joint) , Nickel Plated
4WD/AWD 1500 Series Ext Cab Short Box Pickups (New Style and Old Style)

12477704
Yoke Asm., Prop Shf Slip (with u-joint) , Nickel Plated
4WD/AWD 2500 Series Ext Cab Short Box Pickups (New Style)

12479383
Yoke Asm., Prop Shf Slip (without u-joint) , Nickel Plated

Must Be Ordered With U-Joint Kit P/N 12479126
4WD/AWD 1500 Series Silverado, Sierra Regular Cab Pickups (New Style)

4WD/AWD 1500 Series Suburban, Avalanche, Yukon XL, Escalade EXT, Escalade ESV with AWD (New Style)

K1500 Series Regular Cab Pickup, Tahoe, Suburban, Escalade (Old Style)

12479384
Yoke Asm., Prop Shf Slip, (without u-joint) , Nickel Plated

Must Be Ordered With U-Joint Kit P/N 12479126
4WD/AWD 1500 Series Tahoe, Yukon, Escalade w/ 4WD or AWD (New Style)

12479385
Yoke Asm., Prop Shf Slip (without u-joint) , Nickel Plated

Must Be Ordered With U-Joint Kit P/N 12471510
4WD/AWD 2500HD/3500 Series Silverado and Sierra Regular Cab, Long Bed Pickups with 6.0L (RPO LQ4) Engine (New Style)

89058876
Yoke Asm., Prop Shf Slip (with u-joint) , Nickel Plated
4WD/AWD 2500HD Series Silverado and Sierra Crew Cab, Short Bed Pickups with 5-Speed Allison Transmission (RPO M74) (New Style)

4WD 2500HD/3500 Series Silverado and Sierra Extended Cab Long Bed Pickups with 5-Speed Allison Transmission (RPO M74) (New Style)

4WD 2500HD/3500 Series Silverado and Sierra Regular Cab, Long Bed Pickups with 5-Speed Allison Transmission (RPO M74 build date before 2/2004) (New Style)

4WD/AWD 2500HD Series Silverado and Sierra Extended Cab, Short Bed Pickups with 5-Speed Allison Transmission (RPO M74 build date before 2/2004) (New Style)

89058878
Yoke Asm., Prop Shf Slip (with u-joint) , Nickel Plated
4WD/AWD 2500HD/3500 Series Silverado and Sierra Extended Cab Pickups with 6.0L (RPO LQ4) Engine (New Style)

4WD 2500HD Series Silverado and Sierra Crew Cab, Short Bed Pickups with 6.0L (RPO LQ4) Engine (New Style)

89058880
Yoke Asm., Prop Shf Slip (with u-joint) , Nickel Plated
4WD/AWD 2500HD/3500 Series Silverado and Sierra Regular Cab, Long Bed Pickups with 5-Speed Allison Transmission (RPO M74 build date after 2/2004) or 6-Speed Manual Transmission (RPO ML6) (New Style)

4WD 2500HD Series Silverado and Sierra Extended Cab, Short Bed Pickups with 5-Speed Allison Transmission (RPO M74 build date after 2/2004) or 6-Speed Manual Transmission (RPO ML6) (New Style)

12479126
U Joint Kit
4WD/AWD 1500 Series Silverado, Sierra Regular Cab Pickups (New Style)

4WD 1500 Series Suburban, Avalanche, Yukon XL) (Escalade EXT, Escalade ESV with AWD (New Style)

4WD 1500 Regular Cab Pickup, Tahoe, Suburban, Escalade (Old Style)

Tahoe, Yukon, Escalade w/ 4WD or AWD (New Style)

12471510
U Joint Kit
4WD/AWD 2500HD/3500 Series Silverado and Sierra Regular Cab, Long Bed Pickups with 6.0L (RPO LQ4) Engine (New Style)

88964470
Yoke Asm., Prop Sft Slip (without U joint) Nickel Plated

Must be ordered with U joint kit P/N 88964507
HUMMER H2

88964507
U-Joint
HUMMER H2

Hope this sheds some light on this for you.