AT-88 AUTOMATIC TRANSMISSION — Component Parts (Forward Clutch) 3. CHECK PISTON STROKE OF FORWARD CLUTCH Using SST and a dial indicator, measure the forward clutch piston stroke applying and releasing the compressed air (4 — 8 kg/cm², 57 — 114 psi or 392 — 785 kPa) as shown. SST 09350-30020 (09350-06120) Piston stroke: 7M-GE 3.42 — 3.93 mm (0.1346 — 0.1547 in.) 7M-GTE 3.73 — 4.59 mm (0.1469 — 0.1807 in.) If the values are nonstandard, inspect the discs. 4. REMOVE FLANGE, PLATES AND DISCS (a) Remove the snap ring from the forward clutch drum. (b) Remove the flange, plates and discs. 7M-GE: One flange, five plates and five discs 7M-GTE: One flange, six plates and six discs 5. REMOVE CUSHION PLATE 6. REMOVE PISTON RETURN SPRING (a) Place SST over piston return spring and compress the return spring with a shop press. SST 09350-30020 (09350-07040) (b) Using snap ring pliers, remove the snap ring. (c) Remove the piston return spring. 7. REMOVE FORWARD CLUTCH PISTON (a) Place the forward clutch drum onto the O/D support. (b) Hold the forward clutch piston with hand, apply compressed air to the O/D support to remove the forward clutch piston. (c) Remove the forward clutch piston. (d) Remove the two O-rings from the piston.