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Old 08-15-2007, 07:13 PM   #11 (permalink)
dmaxlover
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What is GM's actual definition of frame beaming?
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Old 08-15-2007, 09:39 PM   #12 (permalink)
johnmay19
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Document ID# 1708926
2005 GMC Truck GMC K Sierra - 4WD

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Subject:Suspension Vibration or Frame Beaming at 40-60 MPH - keywords front miss rear shake shock spring suspension TCC tire vibration #PIT3009B - (10/03/2005)


Models:1999-2006 Chevrolet Silverado
1999-2006 GMC Sierra



The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1708926&psdid=1058&evc=sm#ss1-1708926">Condition/Concern:

Beam shake vibration is usually felt in the seat and occurring between 40-50 mph. Hertz reading using an EVA tool normal are between 8-24 Hz. This condition is most common on extended cab and crew cab models but has also been noted in other models.
<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1708926&psdid=1058&evc=sm#ss2-1708926">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. <LI type=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 is a normal characteristic and no repair attempts should be made. A Field Product Report should be submitted by following bulletin 02-00-89-002C.
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.
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Old 09-05-2007, 11:50 PM   #13 (permalink)
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anyone have any luck with this? my truck seems to have started doing this now...
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Old 09-06-2007, 07:12 AM   #14 (permalink)
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I am going to try the spring/shackle in this thread and see if it helps out.

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Old 09-06-2007, 07:24 AM   #15 (permalink)
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My 2500ld crewcab has been beaming ever since I've owned it. And now with a suspension lift, add-a-leaf, and larger tires it seems a little worse to me. I'm very interested to see how these things spring/shackles actually work for people.
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Old 09-06-2007, 05:12 PM   #16 (permalink)
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Softer springs such as deaver's does not fix the frame beaming.
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Old 09-07-2007, 11:58 AM   #17 (permalink)
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GM Ford and Dodge all have the same issue, although it may occur and different speeds. The root cause is an excitation caused by an inbalance in the rear tires. It'll actually come and go as the tires inbalance comes in and out of phase do to differential slip during cornering. The inbalance can be ever so slight, but since we're exciting a natural frequency within the frame, it doesn't take much to set the system into resonance. Changing shackles and springs will not change the problem, it may effect the speed at which the system is excited slightly (±1-3mph), but it won't get rid of it. Best change to get rid of it or lesson it is to balance your tires (load balanced if possible). Ford and Dodge have mass dampers on the frame rails to fight this problem, I'm not sure why Gm doesn't.
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Old 09-07-2007, 12:10 PM   #18 (permalink)
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I haven't noticed any of the frame beaming type vibration since I installed balance beads in my tires. My old '98 Z-71 extended cab used to do it quite badly right around 42mph. Once I put the balance beads in it greatly reduced if not eliminated the vibration. I changed tires at the same time though so it might be coincidental.
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Old 09-07-2007, 11:44 PM   #19 (permalink)
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This is interesting.. never heard anything about this before.. I just thought it was the tires until I put them on my dad's pickup and it didn't shake....

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Old 09-08-2007, 12:10 AM   #20 (permalink)
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I dont think it will unless you are loaded
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