I have a 1990 Silverado, 350 with 700r trans.
this noise happens in idle, in gear at a stop and under load as well. I can't pin point if it is engine or transmission. Motor was rebuilt over a yr ago and truck run great and noise does not get louder under load.
Please look at the video below and hear the sound for yourself.
http://www.youtube.com/watch?v=DZnrYB6HHks
Thanx
Terence
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Friday, January 14th, 2011 AT 9:46 PM