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Uploaded on Feb 5, 2011
Pulled up next the truck heard it had a Series 60 and decided to record to some audio. The S60 sounds much different in a tractor application that a bus. The sound of the turbo can escape more I believe and secondly the exhaust direction may be another reason...At idle when you have the truck in gear the turbo will whistle, not in gear it will not. With a B500 Allison, same thing happens but it in drive while idling the turbo will whistle and it picks up speed.