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weird exhuast noise? help!

2K views 1 reply 2 participants last post by  brentwoodkris 
#1 ·
so when im drving from 0 mph all the way to 40 mph my vehicle has like a hummming noise. its not coming from the motor but somewhere underneath the vehicle. my check engine light is NOT on. is it the cat convertor? or somethinng else? any ideas or help would be greatly appreciated.
 
#2 ·
Sounds like a pinion, but those usually appear past 50mph...

Need more info to accurately diagnose methinks.
 
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