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Loud bang when cooling down
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Question
SierraSmurf
I have an '05 GMC 2500 HD with the 8.1L and Allison tranny. About 2 or 3 minutes after I shut down the engine, there is a VERY loud metallic "bang" coming from under the hood. I assume that there is metal cooling and contracting somewhere which is causing this noise, possibly the exhaust manifold covers, but have no idea what they would be catching on. Any ideas? This is driving me crazy. It doesn't do it after short trips, only after it's really good and warmed up. Thanks in advance for any light you can shed on this!
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