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Slack In Drivetrain?

kutu

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kutu Enthusiast

kutu

Posted
Posted

My 2007 NBS Sierra Denali AWD has what I can best descibe as a little slack in the drivetrain. It is no bad and it is not there all the time.

 

I first noticed it when going around a small traffiic circle; after coasting into the turn (about 10mph) I then begin to bearly apply a little power I might hear a small click and feel a little bump. Also, from a dead stop, sometimes the I get the same feeling and it comes after I have traveled a couple of feet. I am tempted to think it is "axel wrap", but it does not happen immediately upon realease of the brake.

 

Does anyone else have this issue? Is this just normal slack.

bobcat5544 Enthusiast

bobcat5544

Posted
Posted
My 2007 NBS Sierra Denali AWD has what I can best descibe as a little slack in the drivetrain. It is no bad and it is not there all the time.

 

I first noticed it when going around a small traffiic circle; after coasting into the turn (about 10mph) I then begin to bearly apply a little power I might hear a small click and feel a little bump. Also, from a dead stop, sometimes the I get the same feeling and it comes after I have traveled a couple of feet. I am tempted to think it is "axel wrap", but it does not happen immediately upon realease of the brake.

 

Does anyone else have this issue? Is this just normal slack.

 

 

Is it with or with out auto 4 wheel drive on

kutu Enthusiast

kutu

Posted
  • Author
Posted

It is not selectable. It is AWD, as I understand it, the transfer case acts as another differential between the front and rear.

bobcat5544 Enthusiast

bobcat5544

Posted
Posted
It is not selectable. It is AWD, as I understand it, the transfer case acts as another differential between the front and rear.

 

 

This may fix it

 

Intermittent Slip/Bump On Accel In Auto 4WD - keywords 246eau acceleration case clunk launch noise transfer #PIP3702C - (04/03/2007)

 

Models: 2007 Chevrolet Avalanche, Suburban, Tahoe

2007 GMC Yukon, Yukon XL

Equipped with NVG246 Transfer Case (RPO - NP8)

--------------------------------------------------------------------------------

This PI is being superseded to update models. Please discard PIP3702B.

--------------------------------------------------------------------------------

 

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

 

Condition/Concern:

Slip/stick or launch bump/clunk on accel from a stop or on accel while rolling forward. This condition may be intermittent and will only occur in Auto 4WD on a high traction surface.

 

Recommendation/Instructions:

Transfer Case Control Module (TCCM) reflash software made available to dealers on 04/03/06 with software version 4.0 to correct this concern.

 

Reflash only affected vehicles with appropriate software provided. TIS2WEB will show a menu screen where the technician can make a software selection. Do not reflash all vehicles with this software.

 

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

kutu Enthusiast

kutu

Posted
  • Author
Posted

Thanks

 

The problem discription is exactly what I am experiencing. Maybe this will apply to my transfer case also.

kutu Enthusiast

kutu

Posted
  • Author
Posted

It was the slip yoke.

 

The dealer removed the driveshaft and lubricated the slip yoke and the problem is apparently solved. For a minor problem it was a real pain!

cmoore74 Enthusiast

cmoore74

Posted
Posted

The delaer just lubricated the slip yoke? Doesn't that mean the problem will eventually return once the lubricant is worn away?

 

Not sure if the NBS already have it, but I thought the fix for this was a nickle-plate slip-yoke?

 

I will say almost every GM truck I have owned has had at least some small amount of slack in the drive train. My 1990, 2000, and now my 2006 has that slight clunk.

exracer Enthusiast

exracer

Posted
Posted
The delaer just lubricated the slip yoke? Doesn't that mean the problem will eventually return once the lubricant is worn away?

 

Not sure if the NBS already have it, but I thought the fix for this was a nickle-plate slip-yoke?

 

I will say almost every GM truck I have owned has had at least some small amount of slack in the drive train. My 1990, 2000, and now my 2006 has that slight clunk.

 

 

does anyone have a part # for the nickle plated yokes?.....I have same problem and removing driveshalf every month to grease is getting old...

kutu Enthusiast

kutu

Posted
  • Author
Posted
The delaer just lubricated the slip yoke? Doesn't that mean the problem will eventually return once the lubricant is worn away?

 

Not sure if the NBS already have it, but I thought the fix for this was a nickle-plate slip-yoke?

 

I will say almost every GM truck I have owned has had at least some small amount of slack in the drive train. My 1990, 2000, and now my 2006 has that slight clunk.

 

 

does anyone have a part # for the nickle plated yokes?.....I have same problem and removing driveshalf every month to grease is getting old...

 

 

I have the feeling that this will be the only time my slip yoke will need lubing. I certainly hope that after break-in that it be OK. If this were a widespread problem I think that we would see zerk fittings on the yoke?

Dave in Mpls Enthusiast

Dave in Mpls

Posted
Posted
The delaer just lubricated the slip yoke? Doesn't that mean the problem will eventually return once the lubricant is worn away?

 

Not sure if the NBS already have it, but I thought the fix for this was a nickle-plate slip-yoke?

 

I will say almost every GM truck I have owned has had at least some small amount of slack in the drive train. My 1990, 2000, and now my 2006 has that slight clunk.

 

 

does anyone have a part # for the nickle plated yokes?.....I have same problem and removing driveshalf every month to grease is getting old...

 

 

 

This may help:

 

Document ID# 1580377

 

 

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.

 

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.

 

 

 

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.

 

 

 

Place the J 9522-3 on the open horizontal bearing cups. Press the lower bearing cup out of the yoke ear.

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.

Rotate the propeller shaft . Press the opposite bearing cup out of the drive shaft yoke.

Remove the old slip yoke and universal joint.

Inspect the retaining ring grooves for dirt, corrosion, or pieces of the old ring.

Inspect the bearing cup bores for burrs or imperfections.

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.

Install the new nickel-plated slip yoke and universal joint. See parts table below for parts information.

Remove the bearing cups from the universal joint.

 

 

 

Assemble one bearing cup part way into one side of the yoke. Turn the yoke ear toward the bottom.

Assemble the cross into the yoke so that the trunnion seats freely into the bearing cup.

 

 

 

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.

Install the opposite bearing cup part way into the yoke ear.

Ensure that the trunnions start straight and true into both bearing cups.

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

 

Press the bearing cup into the yoke until the bearing cup retainer groove is visible over the top of the bearing cup.

Assemble the bearing retainer in the retainer groove.

Continue pressing until both retainers can be snapped into place.

 

 

 

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

 

 

Parts are currently available from GMSPO.

 

Warranty Information

For vehicles repaired under warranty, use:

 

Labor Operation

Description

Labor Time

 

F0060

Slip Joint, Propeller Shaft - Replace

0.6 hr

 

 

 

 

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

 

 

© Copyright General Motors Corporation. All Rights Reserved.

brnr17 Enthusiast

brnr17

Posted
Posted

^^^^^^^^^^ that bump when stopping or accelerating from a stop is exactly what i'm feeling in my truck. how do i know if that update has been done? does it cost me anything? i've never taken anything in for a service bulletin before.

cmoore74 Enthusiast

cmoore74

Posted
Posted
^^^^^^^^^^ that bump when stopping or accelerating from a stop is exactly what i'm feeling in my truck. how do i know if that update has been done? does it cost me anything? i've never taken anything in for a service bulletin before.

 

It's not a recall so if you're out of warranty it will most likely cost you unless they are feeling generous.

 

The clunk also has to be bad enough in the dealer's opinion to warrant the repair. My '06 has the clunk (of course), but it is very minor. When I had it in for my free oil change I had them look at it and they said it wasn't bad enough to warrant a repair. I knew it really wasn't that bad on this one, but I wanted to get it on record in case it ever gets bad after the warranty is up.

 

I here it's actually an easy job for a DIY.

Bogle45 Enthusiast

Bogle45

Posted
Posted
It is not selectable. It is AWD, as I understand it, the transfer case acts as another differential between the front and rear.

 

 

This may fix it

 

Intermittent Slip/Bump On Accel In Auto 4WD - keywords 246eau acceleration case clunk launch noise transfer #PIP3702C - (04/03/2007)

 

Models: 2007 Chevrolet Avalanche, Suburban, Tahoe

2007 GMC Yukon, Yukon XL

Equipped with NVG246 Transfer Case (RPO - NP8)

--------------------------------------------------------------------------------

This PI is being superseded to update models. Please discard PIP3702B.

--------------------------------------------------------------------------------

 

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

 

Condition/Concern:

Slip/stick or launch bump/clunk on accel from a stop or on accel while rolling forward. This condition may be intermittent and will only occur in Auto 4WD on a high traction surface.

 

Recommendation/Instructions:

Transfer Case Control Module (TCCM) reflash software made available to dealers on 04/03/06 with software version 4.0 to correct this concern.

 

Reflash only affected vehicles with appropriate software provided. TIS2WEB will show a menu screen where the technician can make a software selection. Do not reflash all vehicles with this software.

 

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

 

 

What years will this work on. I have a similar problem with my 2000 Z71. It occurs while in 2 wheel drive.

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