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Discussion Starter #1
When I go around 70 or 75 mph in my 3500 sierra I get a buzzing or vibration noise in the truck-- it ain't steering or it don't don't feel like a tire.....maybe tranny noise or pump in transmission ,is this normal?


2nd question, when I accelerating with my DURAMAX I get a pitch change in motor around 2000 or 2500 rpms is this a computer thing?


it quickly comes up then goes away.
 

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Does your buzz/vib seem consistant with engine speed or vehicle speed? Can you make it do the noise at same rpm level in a different gear? The pitch change your referring to is likely the pilot injection shutting off, usually this happens around 2700 though.


Eric
 

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Discussion Starter #3
buzz -vib seems constant with speed, only does it on turnpike high speed.........
 
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