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loud knokcing coming from under my truck

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Old June 11th, 2009, 9:51 AM
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Default loud knokcing coming from under my truck
i have a 1990 chevy 3/4ton with a 305 and my truck has never made a knokcing noise before but once i got my exhaust donuts changed everytime i slow down or stop all i hear is knocking. you can hear it slightly when it is in park but you hear it the most when ytoure in gear. any help?
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Old June 11th, 2009, 10:23 AM
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Default knock
need to check the oil pressure ,you may have a bearing issue if it is up to level and 20-30 psi .may be main bearing's
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