Do you have access to a lift? My car seems to make a grinding noise as well.. But it's actually my exhaust vibrating and hiting the rear sway bar. CS exhaust hanger bushings tuck the exhaust in close. Also, I in any case where metal is concerned.. the vibration could come from anywhere. I replaced my drive shaft and trans only to figure out later that my rear had too much play. Just take your car to Nissan and save yourself money/headache. Let an experienced tech handle it.
-Bart
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