After changing my clutch in my 91 SE-R this past weekend, I noticed a strange noise coming from my car (about 2 days after). I think it is coming from my transmission, but it might be a CV joint. When I am driving in first, second, third, not sure about the other gears, my car makes a slight rattling noise when coasting in gear. Soon as I accelerate, either easy, moderately, or hard, the noise goes away. I have heard of some other people having problems with Redline MT90 and that is what I put in my transmission. The shifts seem to have a better feel with the MT90 compared to the previous oil. Has anyone else encountered this problem with their classic? Any help would be greatly appreciated.

Maybe your motor mount??