Shake / Vibration 40-50 mph - Page 3 - Chevy and GMC Duramax Diesel Forum
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Old 01-06-2013, 03:31 PM   eBay Motors  #21 (permalink)
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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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Old 01-19-2013, 06:40 PM   eBay Motors  #22 (permalink)
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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?
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Old 01-25-2013, 03:47 PM   eBay Motors  #23 (permalink)
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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.
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Old 01-25-2013, 09:44 PM   eBay Motors  #24 (permalink)
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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
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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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