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Nnbs Crew Cab Frame Vibration Or Beam Vibration

03blackz71

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03blackz71 Senior Enthusiast

03blackz71

Posted
Posted

I am looking for some info on the TSB for the beam vibration of the frame for the NNBS or NBS crewcabs. I know there is a TSB out for replacing the rear body mounts and it helps eliminate the vibration in the cab. I have this vibration and I had it since almost day one of owning the truck. Since about 2 monthes ago it seams like I notice it more now. I even replaced the tires and it is the same. The truck runs smooth but at about 45-55 mph I get a vibration on smooth roads where I can notice it.

 

What I am looking for is the new part numbers for the upper and lower mounts for the rear of the cab. I am going to be putting on a body lift on in the next couple weeks. I was going to put it on this past weekend but I would like to put the new mounts on at the same time. And I would just send the money and get the mounts myself and install them when I put the body lift on.

 

If some one can help me out that would be great!!

matt3 Enthusiast

matt3

Posted
Posted
I am looking for some info on the TSB for the beam vibration of the frame for the NNBS or NBS crewcabs. I know there is a TSB out for replacing the rear body mounts and it helps eliminate the vibration in the cab. I have this vibration and I had it since almost day one of owning the truck. Since about 2 monthes ago it seams like I notice it more now. I even replaced the tires and it is the same. The truck runs smooth but at about 45-55 mph I get a vibration on smooth roads where I can notice it.

 

What I am looking for is the new part numbers for the upper and lower mounts for the rear of the cab. I am going to be putting on a body lift on in the next couple weeks. I was going to put it on this past weekend but I would like to put the new mounts on at the same time. And I would just send the money and get the mounts myself and install them when I put the body lift on.

 

If some one can help me out that would be great!!

 

If there is a TSB on this I would like to know also. My truck has always had a vibration at about 45mph. I had just gotten used to it so it's not a huge deal anymore but, if it can be fixed I'd be all over it.

Matt_ Senior Enthusiast

Matt_

Posted
Posted

We need a GMT900 TSB thread... i've been trying to find the one for the squeaky driver-side body mount bushing :D

tobias Senior Enthusiast

tobias

Posted
Posted
Document ID# 2054996
999999995.gifSubject:Suspension Vibration Or Frame Beaming At 40-60 MPH (64-80 KM/H) - keywords front rear shake shock spring tire #PIT3009G - (01/29/2008)

 

 

Models:1999-2008 Chevrolet Silverado and Silverado Classic

 

 

 

1999-2008 GMC Sierra and Sierra Classic

 

 

This PI was superseded to update models and buyback info. Please discard PIT3009F.

 

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

 

Condition/Concern:

Beam shake vibration is usually felt in the seat and occurring at speeds between 40-50 mph (64 - 80 km/h). Hertz readings using an EVA tool are normally between 8-24 Hz. This condition is most common on extended cab and crew cab models but has also been noted in other models.

 

Recommendation/Instructions:

The severity of beam shake may vary from vehicle to vehicle. To determine if the concern is beam shake, please perform the following:

 

 

  1. Test drive vehicle to confirm the condition. A beam shake condition will usually respond to concrete type pavements more than asphalt, so the vehicle should be driven over both surfaces if possible.

     

  2. Place 200-500 pounds in the pickup bed between the closed tailgate and the wheel wells. A beaming condition should dissipate.

     

Note: Tires with excessive Radial Force Variation (RFV) or out-of-roundness can intensify the frame beaming concern. The following radial force variation numbers should be used as a guide:

 

P-Metric tires (2wd 1500) 12 lbs or less

 

P-Metric tires (all others) 24 lbs or less

 

LT-tires 30 lbs or less

 

If the concern is determined to be beam shake, this is a characteristic of the vehicle and currently no repair attempts should be made. GM Engineering is currently working on reducing this concern for the light duty 1500 Crew and Extended Cab Models. There will be no changes made to the 1500 regular cab, 1500HD, 2500 or 3500 models.

 

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.

 

 

 

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.

999999994.gif WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

© Copyright General Motors Corporation. All Rights Reserved.

 

 

Document ID# 2054996

03blackz71 Senior Enthusiast

03blackz71

Posted
  • Author
Posted

Thanks but there is a newer one that has the part numbers on it. I found it on alldatadiy.com but my subscription just ran out so I can't look it up.

 

There has to be someone that can look it up.

03blackz71 Senior Enthusiast

03blackz71

Posted
  • Author
Posted

ok this is what I have found searching the web. If someone can comfirm the part number please, Thanks.

 

 

 

 

""GM Campaign #PIT3009J: Suspension Vibration Or Frame Beaming At 40-60 MPH (64-80KM/H) - keywords front rear shake shock spring tire - (Sept 18,2008)""

 

 

Condition/Concern:

 

Beam shake vibration is usually felt and occurring at speeds between 40-50 mph (64-80 km/h). Hertz readings using an EVA tool are normally bewtween 8-24 HZ. This condition is most common on extended cab and crew cab models but has also been noted in other models.

 

Recommendation/Instructions:

 

The severity of the beam shake may vary from vehicle to vehicle. To determine if the concern is beam shake, please perform the following:

 

1. Test drive vehicle to confirm the condition. A beam shake condition will usually respond to concrete type pavements more than asphalt, so the vehicle should be driven over both surfaces if possible.

 

2. Place 200-500 pounds in the pickup bed between the closed tailgate and the wheel wells. A beaming condition should dissipate.

 

 

 

-----------

 

 

If the concern is determined to be beam shake, this a characteristic of the vehicle. GM Engineering has released updated body mounts to reduce this concern for the Crew and Extended Cab Models. There will be no changes made to the Regular Cab Models.

 

FOR CREW AND EXTENDED CAB MODELS, REPLACE THE REAR CAB MOUNTS WITH UPDATED PARTS LISTED BELOW. THESE PARTS SHOULD NOT BE USED ON REGULAR CAB MODELS.

 

New upper and lower mounts should be installed at the left and right rear cab position. The new LOWER mount is a two-piece design, meaning there is a rubber mount with a metal washer. Some models may use a one piece lower mount, meaning the rubber mount has a metal washer molded into it. If the vehicle has the one-piece lower mount design, washers (PN 15854745, Qty 2) will be needed to be used with the new lower mount.

 

Upper Mount 25791031 Qty 2

 

Lower Mount 25791032 Qty 2

 

Washer 15854745 Qty 2 (if needed)

 

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

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