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Discussion Starter #1
I have a 4.3 5 speed and when I'm in low rpm something under the truck rattles. But when I drop the gear or once I've reached a certain rpm(about 2500) it stops. What could it be?

I appreciate the help thanx.
 

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How low of RPM? My old volvo rattled when you lugged the engine... If not that, then it could be alot of different things. Where under the truck?
 

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Discussion Starter #3
I'm thinkin at around 2000 and it comes from somewhere in the middle of the truck or towards the back undercarriage.
 
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