I do not know if the tranny was working before I rebuilt it or not, as I bought it as a core. The old rear drum had some heat spots, probably could have been used, but I had one that was like new so I used it insted. The specs I used had me torque the bands to a certain inch pound figure than back the adjuster out so many turns. I think the kit had another method where you tuned the shaft and tighend the band until it stoped the drum then backed it out so many turns. I might try that insted. I thought the 4.2 Levers actuated the band fater than the 2.9???? I would think the problem would occur all the time if I had the wrong lever or incorrect band adjustments?? Thanks