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Towing - 5th-Wheels & Travel-Trailers 6.2/6.5 and Duramax towing performance? Towing accessories? Truck/trailer setup? Compare RV trailers? Trailer maintenance? Great destinations & vacations? Anything towing or trailer related.

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  #1  
Old 11-26-2008, 02:43 PM
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christophersond christophersond is offline
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Thumbs down 2007 GMC Sierra Classic, 2500HD

Not long ago, I posted a thread on a power train vibration problem I was having with my 2007 GMC Sierra Classic, 2500HD. While the vibration is always present, it noticeable (and quite loud) when I am towing my 5th wheel between 55-65 MPH. The GVWR for the truck and 5th wheel is 17,950, which is well below the rating for the truck. The dealership has been messing with the truck for over a year and a half trying to figure out the problem, and the cure. My patience grew thin, so I wrote a letter to the President & CEO of General Motors. Would you believe I actually received a response?? Today I received a phone call from the executive office of GM. They basically told me the vibration is a characteristic of the truck--live with it!! With that sort of customer service, and attitude, it is no wonder GM is going down the tubes. My truck is a 2500HD, 4WD, SRW, with a crew cab, and long bed. Take my advice, and do not buy one of these trucks..........
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Old 11-26-2008, 05:50 PM
conway conway is offline
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I do not know if this will help but knowledge is never a bad thing. There is a GM Campaign #PIT3009J. This is a suspension vibration or frame beaming problem that manifests itself at 40-50 mph. Basically if you reference the bulletin number they will replace the rear cab mounts on crew and extended cab models. This is warranty work and does not cost anything. They have ordered the parts for my 07 classic & I have heard that it helps.
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2) '07 Classic GMC 2500HD Dmax/Ali Ext/Short 4x4'; Bilsteins, Silastic shackles, BD exhaust manifold; Oil Guard bypass; Lubrication pre oem fuel filter; Tekonsha Prodigy; Federico sway bars; Dipricol boost and egt gauges; Transgo Jr,, Mag-Hytec differential and transmission pan

Last edited by conway; 11-26-2008 at 05:51 PM. Reason: addition of info
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Old 11-26-2008, 08:47 PM
NutNbutGMC
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Quote:
Originally Posted by conway View Post
I do not know if this will help but knowledge is never a bad thing. There is a GM Campaign #PIT3009J. This is a suspension vibration or frame beaming problem that manifests itself at 40-50 mph. Basically if you reference the bulletin number they will replace the rear cab mounts on crew and extended cab models. This is warranty work and does not cost anything. They have ordered the parts for my 07 classic & I have heard that it helps.
Interesting and thank you. I have a 2k7 classic as well.
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Old 11-27-2008, 08:10 AM
mr. monte mr. monte is offline
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I have never noticed this with my '07 classic, crew cab


"knock on wood".....
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Old 11-30-2008, 02:45 PM
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Freightliner3 Freightliner3 is offline
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Do you know how much tongue weight you have.My son had the same problem.It turned out that his new Featherlight goose neck trailer put too much weight on the truck.In turn the drive shaft angle was out of specs. The trailer weight was 15000 empty.About 35% of that was on the the truck.He has a 2005 HD3500. GM did shim the drive shaft and put in heaver springs even though the trailer tongue weight was the real problem.He's had no issues since.
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Old 12-03-2008, 12:42 PM
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christophersond christophersond is offline
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Default GMC Sierra Classic, 2500HD

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Originally Posted by Freightliner3 View Post
Do you know how much tongue weight you have.My son had the same problem.It turned out that his new Featherlight goose neck trailer put too much weight on the truck.In turn the drive shaft angle was out of specs. The trailer weight was 15000 empty.About 35% of that was on the the truck.He has a 2005 HD3500. GM did shim the drive shaft and put in heaver springs even though the trailer tongue weight was the real problem.He's had no issues since.
The pin weight on my 5th wheel is right at 2500 lbs--truck is rated for 3000 lbs. The dealership tried a set of pinion angle shims, and it made the virbation worse. Then they tried two sets os shims, and a new drve shaft. They also checked the drive shaft angle with the 5th wheel in tow, and everything was within the specs. The GVWR for the truck and 5th wheel is 17,790 lbs (truck is rated at 22,000 lbs). My truck has two drive shafts, and I am convinced that is where the problem lies. The young mechanic was about to install some 3500HD springs when the door was slammed in my face by someone within the dealership or GM. All of a sudden it has become a characteristic of the truck--or so I'm told.... Does anyone know where I can find Campaign PIT3009J?
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Old 12-03-2008, 08:31 PM
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Hopefully, this will get you started
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Old 12-28-2008, 05:58 PM
Runaway_Dmax Runaway_Dmax is offline
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My 08 has the same vibration when loaded most noticeable between 52 - 65 mph. More noticeable when temps are below 20*.
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