just did a 904 a week ago using John Copes advise, i wanted a rmvb so a crt rmvb, 4.2 lever, billet servo rear, replaced the front drum single spring to a crt multispring, and blocker rod in accumalator. i purchased a deep pan from trans parts house for 20.00 the rest of the tranny was rebuilt a couple thousand miles ago. shifts are instant now.