Ok I have two v-cross I did transmission flush this weekend.. one went good but the 2nd one slipped on me after 5 min test driving.. it shifted violently coming out of 1 st gear then rev high and shifted hard again from 1st to 2nd.. I got nervous and stopped went thru each gear with brake on and turn off and back on and it seemed ok... I went home and parked it.. any idea what might have happened. Did I over fill??