Ive a r33 with auto for nearly 5 years now, no problems at all, and im not easy on it. I control manually when the shifts happen, but every now and then ill let the computer do it. I am also running an aftermarket ECU (motec M48) and have no problems with line pressures or shift points. It is a FOUR speed box (o/drive being the 4th gear), with a lock up torque converter. I NEVER have over drive switched on unless im travelling over 80k's. All the autochanging in and out at around the 70'k mark is not good on clutch packs.