Vibration / Hum Under Load

By RaysZ71
January 24, 2008 in Ask A GM Technician

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RaysZ71

Posted January 24, 2008

'99 suburban 4wd.

Sounds normal till about 45 then i get this vibration humming noise and it gets louder till about 70 then it quiets down at 75. Louder under load.

I am thinking u joints. The tires are not out of balance, but may be wearinf strange. (they are firestones)

any other things to check?

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