AT-40 A340E (2JZ-GTE) AUTOMATIC TRANSMISSION - OVERDRIVE DIRECT CLUTCH D4791 D4790 (d) Install the retaining plate. (e) Using a screwdriver, install the snap ring. 2. INSTALL RING GEAR FLANGE TO OVERDRIVE PLANETARY RING GEAR (a) Install the ring gear flange. (b) Using a screwdriver, install the snap ring. AT5172 O-Ring O-Ring AT5173 3. INSTALL OVERDRIVE DIRECT CLUTCH PISTON (a) Coat new O-rings with ATF and install them on the O/D direct clutch piston. AT5194 (b) Being careful not to damage the O-rings, press the direct clutch piston into the clutch drum with both hands. Return Spring AT5195 4. INSTALL PISTON RETURN SPRING (a) Install the piston return spring to the piston.