Shake / Vibration 40-50 mph - Page 3 - Chevy and GMC Duramax Diesel Forum
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post #21 of 24 (permalink) Old 01-06-2013, 03:31 PM
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Location: Omaha, NE
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I have the same thing but from 60-65... I just figured out it was my u joints and support bearing.

-Russell- (Yat-Yas)
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post #22 of 24 (permalink) Old 01-19-2013, 06:40 PM
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Hey I had my toolbox in the bed, in the rear of the bed, and it seemed to help the vibration, any ideas? Cab mounts?

06 SIERRA 2500HD 4X4 LBZ
EFI Live DPS 5(by Kory) , Edge CTS Monitor

S&B Intake, MBRP cat back, EGR blocked, & sticked
Drivers 3" IC pipe, EGT Probe

20's wrapped in 305/55 Nittos, Linex bed liner, Ranch Hands
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post #23 of 24 (permalink) Old 01-25-2013, 03:47 PM
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Mine did it (06 LBZ) and I tried rebalancing and rotating the tires. I started to look at frame beaming but it turned out the front passenger side Replaced it and rides like new again.

2006 Silverado 2500HD CCSB LBZ Dark Blue

4" MBRP Cat-Back w/ 5"x18" black tip & 3" MBRP downpipe, BD Driver Manifold w/ EGT probe, Westin Black Grille Guard, Line-X, Retrax Bed Cover, Truxedo LED bed lighting, Auxillary 55W Back-up Lights, LED Reverse & Tag Lights, Dually Rear Light Bar, Titan 52 Gal Tank, 35% Front Window Tint, Cooper Discoverer AT3 Tires, Bilstein 5100, Prodigy Brake Controller, Husky Floor Liners, Color Matched Handles, Edge CS Gauge w/ Overhead Console Mount, Kicker Speakers and Tweeters, Pump Rub Fix
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post #24 of 24 (permalink) Old 01-25-2013, 09:44 PM
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I had the same problem on my 08 LMM. I replaced the cab mounts and still had it. I was constantly having my tires balanced. I finaly bit the bullet and bought the sulastics. I could not go more than a few hundred miles without this problem at speeds around 60-65. I know have just over 2K since I have installed the sulastics and no problems. Best purchase I ever made. Good luck

2008 CC/SB LTZ, Ravelco, Stage 5 levling kit NorCal nick,with daystar keys, FOX 2.0 shocks, sulatics shackle, Nitto trail grappler 295/70/17 on black rhino wheels. EFI live dsp5, MBRP 4" Turbo back, diamond eye down pipe, SDP egr delete, CTS gauges with EGT probe, Airdog 165 W/ fuel pressure regulator, lower rear cab mounts, Transgo JR, Mag Hytech rear diff cover, Allison stamped oversized tranny pan
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