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

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- - Duramax LB7 5th gear vibration. Help!!!! (https://www.dieselbombers.com/chevy-gmc-duramax-01-04-lb7/108719-duramax-lb7-5th-gear-vibration-help.html)

Koolcarguy01

02-04-2013 03:00 AM

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.

Gnats on

03-01-2013 09:19 PM

Have you balanced your tires may have a bad tire just a suggestion

Hotforteacher

03-03-2013 08:07 PM

Is it just fifth gear or is it more the speed that makes it do it?

Koolcarguy01

04-15-2013 05:09 PM

its JUST 5th

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