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What is causing clunk noise in rearend on 2000 chevy silverado 4wd

Customer Question

what is causing clunk noise in rearend on 2000 chevy silverado 4wd
Submitted: 7 years ago.
Category: Chevy
Expert:  Bob replied 7 years ago.
Does it only make the noise when you are starting and stopping and can you feel it more than hear it?
Customer: replied 7 years ago.
Reply to Bob's Post: it does when i take off I can hear it more than I feel it
Expert:  Bob replied 7 years ago.

The following Technical Service Bulletin from GM covers what has been the biggest problem causing this condition. For a long time, we were removing the drive shafts and lubricating the front slip yoke splines to stop this, but that was only a temporary fix on most of them, this new part seems to cure most of the problem. You will always have some noise, slight but some, because of all the moving components related to the fact that it is a 4X4. You have the internal slack in the transfer case as well as the drive line and rear differential to contend with. It will never be totally quiet, but this step helps immensely.

Document ID#(NNN) NNN-NNNN
2000 Chevrolet Chevy K Silverado - 4WD

 

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

 


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).


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.

  1. Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information (SI Document ID #349918).
  2. 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.

  3. Remove the bolts and the yoke retainers from the pinion flange.
  4. Slide the propeller shaft forward and out of the rear pinion flange.
  5. 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.

  6. 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.

  7. Disassemble the snap rings by pinching the ends together with a pair of pliers.
  8. 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.
    Object Number: 1222  Size: SH

  9. Place the universal joint so that the lower ear of the yoke is supported on a 30 mm (1-1/8 in) hex head socket or a 27 mm (1-1/16 in) socket.
    Object Number: 365153  Size: SH

  10. Place the J 9522-3 on the open horizontal bearing cups. Press the lower bearing cup out of the yoke ear.
  11. If you do not completely remove the bearing cup, lift the cross and insert the J 9522-5 between the seal and the bearing cup you are removing. Continue pressing the bearing cup out of the yoke.
  12. Rotate the propeller shaft . Press the opposite bearing cup out of the drive shaft yoke.
  13. Remove the old slip yoke and universal joint.
  14. Inspect the retaining ring grooves for dirt, corrosion, or pieces of the old ring.
  15. Inspect the bearing cup bores for burrs or imperfections.
  16. Clean the retaining ring grooves. Corrosion, dirt, rust, or pieces of the old retaining ring may prevent the bearing cups from pressing into place or prevent the bearing retainers from properly seating.
  17. Install the new nickel-plated slip yoke and universal joint. See parts table below for parts information.
  18. Remove the bearing cups from the universal joint.
    Object Number: 1223  Size: SH

  19. Assemble one bearing cup part way into one side of the yoke. Turn the yoke ear toward the bottom.
  20. Assemble the cross into the yoke so that the trunnion seats freely into the bearing cup.
    Object Number: 1224  Size: SH

  21. With the trunnion seated in the bearing cup, press the bearing cup into the yoke until the bearing cup is flush with the yoke ear.
  22. Install the opposite bearing cup part way into the yoke ear.
  23. Ensure that the trunnions start straight and true into both bearing cups.
  24. Press the opposite bearing cup into the yoke ear while working the cross all the time in order to inspect for free unbinding movement of the trunnions in the bearing cups.

    Important: If there seems to be a hang up or binding, stop pressing. Inspect the needle bearings for misalignment in the bearing cup

  25. Press the bearing cup into the yoke until the bearing cup retainer groove is visible over the top of the bearing cup.
  26. Assemble the bearing retainer in the retainer groove.
  27. Continue pressing until both retainers can be snapped into place.
    Object Number: 365168  Size: SH

  28. If the retainer is difficult to seat, the yoke can be sprung slightly with a firm blow from a soft-faced dead blow hammer.
  29. 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.
  30. Install the slip yoke onto the output shaft in the transfer case.
  31. Align the reference marks on the pinion flange and the propeller shaft.
  32. Install the yoke retainers and bolts.

    Tighten
    Tighten the yoke retainer bolts to 25 N·m (19 lb ft).

  33. 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

Parts are currently available from GMSPO.

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