AUTOMATIC TRANSMISSION — Component Parts (Overdrive Brake) AT-81 4. INSTALL CLUTCH DRUM THRUST WASHER Coat the thrust washer with petroleum jelly and install it onto the O/D support. HINT: Make sure that the lug shape matches the hole on the O/D support. 5. CHECK OVERDRIVE BRAKE PISTON MOVING (a) Place the O/D support assembly onto the direct clutch assembly. (b) Apply compressed air into the oil passage as shown, and be sure that the O/D brake piston moves smoothly.