AT-80 AUTOMATIC TRANSMISSION — Component Groups (Transmission Case and Rear Brake Pistons) Transmission Case and Rear Brake Pistons Transmission Case Piston Return Spring Snap Ring Spring Retainer Sleeve No. 3 Brake Outer Piston Inner Piston ◆O-Ring ◆ Non-reusable part AT8431 SST Z2J14 C6671 DISASSEMBLY OF TRANSMISSION CASE AND REAR BRAKE PISTONS 1. COMPRESS RETURN SPRINGS AND REMOVE SPRING RETAINER SNAP RING (a) Install the SST. Gradually and evenly tighten the bolt to compress the springs, being careful not to damage the transmission case with SST. SST 09350-20013 (09369-20040) (b) Using a screwdriver and hook, remove the snap ring. 2. REMOVE SPRING RETAINER AND SIXTEEN SPRINGS