ck performance has the best shift kit on the market for the2004r .it includes a hi performance servo ,seperator plate ,accumulator spring ,pump boost valvesand spring and other parts and teck info to get it working right .nuff said ckperformance .if anyone in ny ,nj, or pa wants to try one for free and post the results on the message board feel free to call and well install it for free also.only 1 freebee.ckperformance newyorkcity preffered.