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Rhythmic vibrations in 6th gear when applying load

jmac

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jmac Enthusiast

jmac

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I am having rhythmic vibrations in 6th gear when applying load to my AWD 2008 Sierra Denali.  The noticeable vibration starts around 60 mph and if I let off gas or place truck manually into 5th gear the vibration disappears.  I do not notice it at lower speeds or in any gear besides 6th.  Transmission fluid has been exchanged every 50K and was done about 25K ago.  My front axles are fairly new at 1 year old and front u-joint changed few months ago.  I can’t hear any sound but notice vibration through floor.  I do not notice any slack in rear u-joint at all.  At this point, I am either thinking transmission or exhaust.   Any diagnostic ideas would be welcomed.

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