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I too have a Chevy Silverado 1500 Sport Side w/4.8 Vortex engine & FlowMasters. I have about 120,000 miles on my truck. Purchased in 2004 and had only minor repairs done until recently. I have a vibration in the vehicle that no mechanic can seem to find the cause of. I've put about $2500.00 in it trying to fix the problem but nothing is working. I'm down to having the drive shaft balanced. This is the last option we are able to come up with! Have you heard of anyone having this problem? You can feel it in the truck but not in the steering wheel. Only vibrates from about 40 mph to a little over 60mph. After that, it mellows out some! Any one have any ideas?Report it
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