Ok, so changing to redline tranny fluid cures the chattering and rough shifting, before I decide to do this...will it void my warrenty if my tranny goes out?
No, it should not void your warrantee. As a matter of fact my dealer, when I mentioned my transmission noise, offered to reimburse me if I had a local shop change to Redline fluid. Instead the dealer is going to change the fluid for me on Tuesday -- no charge. Great deal, heh?