Duramax LB7 5th gear vibration. Help!!!! - Diesel Bombers



Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

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Old 02-04-2013, 04:00 AM
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Default Duramax LB7 5th gear vibration. Help!!!!

Just bought this truck. Has 150k miles. 5 speed auto allison tranny. Every single time the trans hits 5th gear, it vibrates. Like out of balance driveline annoying drone vibration. If its in 5th gear at highway speed, its vibrating. All the way passed 65-70 mph. And the driveshaft, carrier, and u joints are all new. Trans shifts excellent, never slips, just vibs in 5th. Please help.
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Old 03-01-2013, 10:19 PM
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Have you balanced your tires may have a bad tire just a suggestion
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Old 03-03-2013, 09:07 PM
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Is it just fifth gear or is it more the speed that makes it do it?
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Old 04-15-2013, 06:09 PM
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its JUST 5th
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