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I have a 2008 F-250 4x4 , all of a sudden I hear a knocking noise coming from my exhaust, any answers?


best to investigate further -

best to investigate further - put it up on a lift and check the exhaust front to rear - make sure its not the engine knocking - no check engine lite?

no engine light, only happens

no engine light, only happens when I start it. Not when I put it gear

Check for loose, broken or

Check for loose, broken or missing exhaust hangers (rubber pieces which suspend the exhaust do that it doesn't bump against the body or frame).
The engine will move to one side or the other when starting, due to torque. If an exhaust hanger is missing or broken it can allow the exhaust to hit somthing during start-up.

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