2015 Silverado 5.3 Slip yoke clunk ?

[14silverado4.3]

I bet that the trucks that are used for initial qualification testing receive much better quality control at all levels. They would definitely check and recheck tightness of critical fasteners on such trucks and make sure wheels/tires meet all specs and are balanced properly.

My theory for those with loose ubolts. These are/were pulled off the line for rework / repair...GM may have found an out of spec condition / most likely axle related.

 

They either failed to retighten after repair (most likely another defective axle) or began the tear down process and GM exec made a risk call to sell them as is due to no safety concern... risk vs reward!

[Ezrider1]

I,m new to this fourm, I bought a 2015 GMC crew cab the other day was built 9th month of 2014 started reading this and went out and check the U bolts on the rear axle, I'd say they were some where around 45 to 50 got about 1/2 to 3/4 turn out of them getting them to 78 foot lbs.

 

I was reading something about the transmissions on the 2014 before I signed up to this fourm and want to through out something about the trans temps, but cant seem to find where I was at? can somebody throw up a link to it for me?

[namanc6]

Well, I just bought my 2015 crew cab 4x4 z71. I too am unfortunately hearing these clunks. I thought it was just me. But I decided to start researching and came across this thread. I'll try torquing the bolts myself, if that doesn't work, I'll take it to my dealership here in SA,TX.

 

 

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[WLC]

Installed spring clamps and tightened the u-bolts on the axle today. We'll see if it helps with the low speed clunks.My springs were not uniform alinement in front or back side of axle. Installed on the front of axle.

[fondupot]

Can the slip yoke be greased like previous generation trucks by simply dropping the driveshaft and packing the splines with grease?

 

I remember doing this on my 2002 Silverado w/ the 4L60E transmission. Helped with the slip yoke clunk a bit.

[WLC]

Clunks seem to be somewhat refined but the ride is stiffer now. I will try it for a while.

Installed spring clamps and tightened the u-bolts on the axle today. We'll see if it helps with the low speed clunks.My springs were not uniform alinement in front or back side of axle. Installed on the front of axle.

[HondaHawkGT]

Can the slip yoke be greased like previous generation trucks by simply dropping the driveshaft and packing the splines with grease?

 

I remember doing this on my 2002 Silverado w/ the 4L60E transmission. Helped with the slip yoke clunk a bit.

 

They say not to do it with the new trucks.

 

TECHNICAL Bulletin No.: 09-04-21-003D

Date: January 14, 2011

Subject: Clunk Noise at Stop or from Launch (Clean/Lubricate Rear Propshaft Slip Yoke Splines)

Models:

2007-2009 Chevrolet Silverado 1500 Series

2008-2009 Chevrolet Avalanche, Suburban, Tahoe 1500 Series

2007-2009 GMC Sierra 1500 Series

2008-2009 GMC Yukon, Yukon XL 1500 Series

Equipped with 4WD (RPO NQG, NQH)

 

Attention:

This bulletin contains a procedure to clean/lubricate the rear propshaft slip yoke splines and replace, if necessary. Check the history on this vehicle. If the lubrication procedure has been performed previously, then continue on and replace the transfer case rear output shaft.

 

Supercede:

This bulletin is being revised to update the warranty statement. Please discard Corporate Bulletin Number 09-04-21-003C (Section 04 - Driveline/Axle).

 

Condition

Some customers may comment on a bump feel or Clunk noise at a stop or on launch. Customers may also comment that the bump feel or Clunk is noticed after the vehicle has come to a complete stop and that it feels as if the vehicle was bumped from behind.

Cause

This condition may be caused by a slip/stick condition between the rear propshaft slip yoke and the transfer case rear output shaft splines. Braking to a complete stop can force the propshaft slip yoke forward into the transfer case while the vehicle rebounds slightly backward after stopping its momentum.

Correction

Note

Do not use grease for lubrication of the slip yoke splines on 4WD vehicles. The output shaft in a 4WD transfer case does not have a grease retainer to keep the grease from migrating into the transfer case and mixing with the fluid inside. Grease is not compatible with the automatic transmission fluid (ATF) used in the transfer case and can cause damage if mixed.

 

Verify the customer's concern.

Clean/Lubricate Rear PropShaft Slip Yoke Splines 1. Remove the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI. 2. Inspect the rear propshaft slip yoke splines.

Note

Protect the transfer case rear seal from Brake Clean.

3. Clean the rear propshaft slip yoke splines with Brake Clean or equivalent and a shop towel. 4. Assure that the splines are free of rust or other foreign material. 5. Lubricate the spline with Automatic Transmission Fluid, P/N 88861003 (in Canada, 19264717). 6. Reinstall the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI. 7. Road test the vehicle and verify that the noise is gone. 8. If the vehicle has a repeat concern after lubricating the slip yoke splines, replace the rear output shaft.

 

Replace Transfer Case Rear Output Shaft

Note

Do Not replace the output shaft unless the cleaning and lubrication procedure is ineffective.

1. Remove the transfer case assembly. 2. Disassemble the transfer case. Refer to Transfer Case Disassemble in SI. 3. Replace the transfer case rear output shaft. Refer to the Parts Information below. 4. Assemble the transfer case. 5. Reinstall the transfer case assembly.

[fondupot]

 

They say not to do it with the new trucks.

 

TECHNICAL Bulletin No.: 09-04-21-003D

Date: January 14, 2011

Subject: Clunk Noise at Stop or from Launch (Clean/Lubricate Rear Propshaft Slip Yoke Splines)

Models:

2007-2009 Chevrolet Silverado 1500 Series

2008-2009 Chevrolet Avalanche, Suburban, Tahoe 1500 Series

2007-2009 GMC Sierra 1500 Series

2008-2009 GMC Yukon, Yukon XL 1500 Series

Equipped with 4WD (RPO NQG, NQH)

 

Attention:

This bulletin contains a procedure to clean/lubricate the rear propshaft slip yoke splines and replace, if necessary. Check the history on this vehicle. If the lubrication procedure has been performed previously, then continue on and replace the transfer case rear output shaft.

 

Supercede:

This bulletin is being revised to update the warranty statement. Please discard Corporate Bulletin Number 09-04-21-003C (Section 04 - Driveline/Axle).

 

Condition

Some customers may comment on a bump feel or Clunk noise at a stop or on launch. Customers may also comment that the bump feel or Clunk is noticed after the vehicle has come to a complete stop and that it feels as if the vehicle was bumped from behind.

Cause

This condition may be caused by a slip/stick condition between the rear propshaft slip yoke and the transfer case rear output shaft splines. Braking to a complete stop can force the propshaft slip yoke forward into the transfer case while the vehicle rebounds slightly backward after stopping its momentum.

Correction

Note

Do not use grease for lubrication of the slip yoke splines on 4WD vehicles. The output shaft in a 4WD transfer case does not have a grease retainer to keep the grease from migrating into the transfer case and mixing with the fluid inside. Grease is not compatible with the automatic transmission fluid (ATF) used in the transfer case and can cause damage if mixed.

 

Verify the customer's concern.

Clean/Lubricate Rear PropShaft Slip Yoke Splines 1. Remove the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI. 2. Inspect the rear propshaft slip yoke splines.

Note

Protect the transfer case rear seal from Brake Clean.

3. Clean the rear propshaft slip yoke splines with Brake Clean or equivalent and a shop towel. 4. Assure that the splines are free of rust or other foreign material. 5. Lubricate the spline with Automatic Transmission Fluid, P/N 88861003 (in Canada, 19264717). 6. Reinstall the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI. 7. Road test the vehicle and verify that the noise is gone. 8. If the vehicle has a repeat concern after lubricating the slip yoke splines, replace the rear output shaft.

 

Replace Transfer Case Rear Output Shaft

Note

Do Not replace the output shaft unless the cleaning and lubrication procedure is ineffective.

1. Remove the transfer case assembly. 2. Disassemble the transfer case. Refer to Transfer Case Disassemble in SI. 3. Replace the transfer case rear output shaft. Refer to the Parts Information below. 4. Assemble the transfer case. 5. Reinstall the transfer case assembly.

 

 

That doesn't have the 2014+ trucks on it. In my owners manual, there is a part number listed for grease to be used on front and rear slip yokes.

 

 

 

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[HondaHawkGT]

That's odd. It's the same MP 3023/3024 transfer case in both the k2xx trucks as the gmt900 trucks in the bulletin. I did find this:

 

GM Customer Care and Aftersales

 

 

*URGENT - DISTRIBUTE IMMEDIATELY*

 

 

DATE: November 4, 2010

SUBJECT: Do Not use Slip Yoke Grease from Bulletin #09-04-17-002C on 4WD Vehicles.

MODELS: 2007 – 2009 Chevrolet Silverado 1500 Series

 

2008 – 2009 Chevrolet Avalanche, Suburban, Tahoe 1500 Series

 

2007 – 2009 GMC Sierra 1500 Series

 

2008 – 2009 GMC Yukon, Yukon XL 1500 Series

 

Equipped with 4WD (RPO NQG, NQH)

 

TO: Chevrolet/GMC Dealers

ATTN: Service Manager and Parts Manager

 

A new grease, part # 19257121 (in Canada, 19257122), was recently released for lubrication of slip yoke splines to repair a condition of a bump feel or clunk noise at stop or from launch on the vehicles equipped with 4L60 Automatic Transmission (RPO M30) and 2WD. Please see Bulletin # 09-04-17-002C for details.

 

Do not use the new grease for lubrication of slip yoke splines on 4WD vehicles. The output shaft in a 4WD transfer case does not have a grease retainer to keep the grease from migrating into the transfer case and mixing with the fluid inside. The new grease is not compatible with the Automatic Transmission fluid used in the transfer case and can cause damage if mixed. Lubricate the splines on 4WD vehicles with Automatic Transmission Fluid, P/N 88861003 (in Canada, 88861004). Please refer to Bulletin # 09-04-21-003B for repairing the bump feel or clunk noise condition on 4WD vehicles.

 

 

#09-04-21-003B: Clunk Noise at Stop or From Launch (Clean/Lubricate Rear Propshaft Slip Yoke Splines) - (Aug 11, 2009)

 

 

Subject: Clunk Noise at Stop or from Launch (Clean/Lubricate Rear Propshaft Slip Yoke Splines)

 

 

Models: 2007-2009 Chevrolet Silverado 1500 Series

 

2008-2009 Chevrolet Avalanche, Suburban, Tahoe 1500 Series

 

2007-2009 GMC Sierra 1500 Series

 

2008-2009 GMC Yukon, Yukon XL 1500 Series

 

Equipped with 4WD (RPO NQG, NQH)

 

Attention: This bulletin contains a procedure to clean/lubricate the rear propshaft slip yoke splines and replace, if necessary. Check the history on this vehicle. If the lubrication procedure has been performed previously, then continue on and replace the transfer case rear output shaft.

 

Condition:

Some customers may comment on a bump feel or clunk noise at a stop or on launch. Customers may also comment that the bump feel or clunk is noticed after the vehicle has come to a complete stop and that it feels as if the vehicle was bumped from behind.

 

Cause:

This condition may be caused by a slip/stick condition between the rear propshaft slip yoke and the transfer case rear output shaft splines. Braking to a complete stop can force the propshaft slip yoke forward into the transfer case while the vehicle rebounds slightly backward after stopping its momentum.

 

Correction:

Note: The clunk noise may also be due to fuel movement in the fuel tank when not completely full. If the condition is eliminated after filling the fuel tank, the noise is isolated to the fuel movement in the tank. Please make no repair attempts, as this noise is considered an operating characteristic.

 

Verify the customer's concern.

 

Clean/Lubricate Rear PropShaft Slip Yoke Splines

Remove the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.

Inspect the rear propshaft slip yoke splines.

Note: Protect the transfer case rear seal from Brake Clean.

 

Clean the rear propshaft slip yoke splines with Brake Clean or equivalent and a shop towel.

Assure that the splines are free of rust or other foreign material.

Lubricate the spline with Automatic Transmission Fluid, P/N 88861003 (in Canada, 88861004).

Reinstall the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.

Road test the vehicle and verify that the noise is gone.

If the vehicle has a repeat concern after lubricating the slip yoke splines, replace the rear output shaft.

Replace Transfer Case Rear Output Shaft

Note: Do Not replace the output shaft unless the cleaning and lubrication procedure is ineffective.

 

Remove the transfer case assembly. Refer to Transfer Case Assembly Replacement in SI.

Disassemble the transfer case. Refer to Transfer Case Disassemble in SI.

Replace the transfer case rear output shaft. Refer to the Parts Information below.

Assemble the transfer case.

Reinstall the transfer case assembly.

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

 

I wish we could get a clarification from a GM rep. I wonder if there's a moly based product that's compatible with ATF. Honda makes a moly paste for their motorcycle driveshafts.

[fondupot]

 

I wish we could get a clarification from a GM rep. I wonder if there's a moly based product that's compatible with ATF. Honda makes a moly paste for their motorcycle driveshafts.

 

Yea same here. I actually ordered the grease that was listed in my manual, same exact part # and everything. I was gonna grease my slip yoke when I had a chance.

 

Gonna hold off until I get clarification.