Thank you for the good news, ChevyTruck55. It's great to hear of potential correction! I'll know soon if the Dealership in Austin where I bought my 2012 1500LTZ 4x4 gets similar results, as I too mentioned the discussions of "the yoke" I've found in this forum. I've had it in the shop since last Tuesday for another warranty item when the mechanism operating the sliding window from the cab to the bed failed, so I assume they're investigating my truck's "jolt and slam" phenomena.


Oddly, the 2015 Z-71 4x4 the dealer kindly loaned me has a lesser effect of the phenomena. Hopefully, the more owners express themselves about this topic the quicker a permanent correction is engineered and implemented.


Thanks again for sharing.

 

I used the Better Business Bureaus 'Auto Line Program' to file a complaint against Chevrolet and to go to arbitration. It was me against Chevrolet with their District Manager of Aftersales present, and Detroit on a conference call. Even with a video tape showing the problem, and what I thought was a strong case, I lost.


Here is the findings from the arbitrator:


"Because, as indicated above, it is not an intended operation of the vehicle, the clunk and hesitation can be considered a defect. However, in that the condition has occurred not only in this model of vehicle but in other vehicles including passenger vehicles and light trucks manufactured by Chevrolet, to the point that a technical service bulletin has been issued discouraging piecemeal repairs of the drivetrain, it can be classified as a defect in design. As the express general warranty as well as the drive train warranty for the vehicle relate to manufacturing defects in the parts and workmanship in the assembly of the vehicle, and not to defects in design, it is not within the jurisdiction of the Better Business Auto Line Program to render an award for the repurchase or replacement of the vehicle for such a design defect."


What is interesting is the fine print of the service bulletin #99-04-20-002H


"Note; Compare this complaint vehicle to a like vehicle. If the results are the same, this is a normal condition."


"If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition."


Chevrolet is admitting that there are problems not related to this bulletin. But we, as the little consumers against the big corporations don't have a chance unless we can afford to hire the best attorneys. And Chevrolet is not liable for defects in their designs.

 

DOESS THIS SOUND FAMILIAR?
Document ID# 1430424
2003 Chevrolet Chevy Suburban - 4WD
--------------------------------------------------------------------------------
Information on 2-3 Upshift or 3-2 Downshift Clunk Noise #01-07-30-042B - (Jan 16, 2004)
Information on 2-3 Upshift or 3-2 Downshift Clunk Noise
2004 and Prior Light Duty Trucks
2003-2004 HUMMER H2
with 4L60E or 4L65E Automatic Transmission (RPOs M30, M32)

This bulletin is being revised to add the 2004 model year. Please discard Corporate Bulletin Number 01-07-30-042A (Section 07 - Transmission/Transaxle).

Some vehicles may exhibit a clunk noise that can be heard on a 2-3 upshift or a 3-2 downshift.
During a 2-3 upshift, the 2-4 band is released and the 3-4 clutch is applied. The timing of this shift can cause a momentary torque reversal of the output shaft that results in a clunk noise. This same torque reversal can also occur on a 3-2 downshift when the 3-4 clutch is released and the 2-4 band applied. This condition may be worse on a 4-wheel drive vehicle due to the additional tolerances in the transfer case.
This is a normal condition. No repairs should be attempted.
--------------------------------------------------------------------------------
This notorious "CLUNK" is Chevrolet Engineering's design feature, at least for some of its vehicles. The above came from the forum in 2004.

 

Document ID# 1430424
2003 Chevrolet Chevy Suburban - 4WD
--------------------------------------------------------------------------------
Information on 2-3 Upshift or 3-2 Downshift Clunk Noise #01-07-30-042B - (Jan 16, 2004)
Information on 2-3 Upshift or 3-2 Downshift Clunk Noise
2004 and Prior Light Duty Trucks
2003-2004 HUMMER H2
with 4L60E or 4L65E Automatic Transmission (RPOs M30, M32)

This bulletin is being revised to add the 2004 model year. Please discard Corporate Bulletin Number 01-07-30-042A (Section 07 - Transmission/Transaxle).

Some vehicles may exhibit a clunk noise that can be heard on a 2-3 upshift or a 3-2 downshift.
During a 2-3 upshift, the 2-4 band is released and the 3-4 clutch is applied. The timing of this shift can cause a momentary torque reversal of the output shaft that results in a clunk noise. This same torque reversal can also occur on a 3-2 downshift when the 3-4 clutch is released and the 2-4 band applied. This condition may be worse on a 4-wheel drive vehicle due to the additional tolerances in the transfer case.
This is a normal condition. No repairs should be attempted.
--------------------------------------------------------------------------------

 

Warning to light-duty truck buyers: Some new half ton trucks still CLUNK. It's a driveline defect Chevrolet engineers into these vehicles. It's been present in some light-duty vehicle for over a decade.


Here's Chevy's description (sound familiar):


Document ID# 1430424
2003 Chevrolet Chevy Suburban - 4WD
--------------------------------------------------------------------------------
Information on 2-3 Upshift or 3-2 Downshift Clunk Noise #01-07-30-042B - (Jan 16, 2004)
Information on 2-3 Upshift or 3-2 Downshift Clunk Noise
2004 and Prior Light Duty Trucks
2003-2004 HUMMER H2
with 4L60E or 4L65E Automatic Transmission (RPOs M30, M32)

This bulletin is being revised to add the 2004 model year. Please discard Corporate Bulletin Number 01-07-30-042A (Section 07 - Transmission/Transaxle).

Some vehicles may exhibit a clunk noise that can be heard on a 2-3 upshift or a 3-2 downshift.
During a 2-3 upshift, the 2-4 band is released and the 3-4 clutch is applied. The timing of this shift can cause a momentary torque reversal of the output shaft that results in a clunk noise. This same torque reversal can also occur on a 3-2 downshift when the 3-4 clutch is released and the 2-4 band applied. This condition may be worse on a 4-wheel drive vehicle due to the additional tolerances in the transfer case.
This is a normal condition. No repairs should be attempted.
--------------------------------------------------------------------------------

 

BTW: Don't buy Service's explanation that it's a 6-speed transmission phenomenon. It's been around for a decade (or more).


Metal to metal, CLUNK, likely results in catastrophic failure. Pray your warranty is still in force.

 

i have the same issue with my 2012 silverado since day one i bought new zero miles and they tell me the same **** it is normal i don't agree that that horrific sound is normal.. you described exactly the same issue i have ..

 

Spr63, I bought a brand new 2014 Silverado crew cab, it does the same thing as my 08 use to do but, not as often and a lot less noise when it does do it.. I did also make a post of this problem with the 08 Silverado I owned. When I had it I got the same actions you got chrome yoke and packing of yoke with a heavy duty grease.
Should they do something, yes. Will they do any thing,no. I hope they get it squared away for you soon.


Chevy

 

I've had the same issue with my driveline. There is a noticeable clunk/jolt in the driveline when accelerating after slowing while driving. I brought my vehicle in and the technicians acknowledged there was definitely a noticeable clunk and tried to reprogram the TCM. That didn't work. So I brought it back and they looked at the yolk, it was ok. The "bulletin" was found after trying to fix the clunk problem so they wouldn't work on it anymore.

I've contacted the BBB and have an open case for this problem.

If you haven't, please take the time and open a case with the BBB is you are having this issue.

Contact your local BBB representative at this site.

Find A BBB

Hopefully we can get this issue resolved together!

 

63,000 miles on my truck now and I still have the driveline clunk problem. I lost my case using the BBB. See above thread for the ruling. All Chevrolet says is I have a 100,000 mile drive train warranty, in case there are any problems. I just hope that if I have any problems, it happens before the warranty expires. If anyone was won a case against Chevrolet for this problem, please let us know how!! Maybe time for a class action suit.