AUTOMATIC TRANSMISSION(4AT) > AT Main Case
1. HIGH CLUTCH AND REVERSE CLUTCH
Check the following items.
• Drive plate surface wear and damage
• Snap ring wear, return spring setting and breakage, and snap ring retainer deformation
• Lip seal and D-ring damage
• Piston and drum check ball operation
2. PLANETARY GEAR AND LOW CLUTCH
Check the following items.
• Drive plate surface wear and damage
• Snap ring wear, return spring setting and breakage, and spring retainer deformation
• Lip seal and D-ring damage
• Piston check ball operation
• Inspect the total end play, and adjust it to be within the standard value. 
Check the following items.
• Drive plate surface wear and damage
• Snap ring wear and spring retainer deformation
• Lip seal and D-ring damage
• Inspect the total end play, and adjust it to be within the standard value. 
• Check that the snap ring is not damaged and the seal ring is not deformed.
• Inspect the total end play, and adjust it to be within the standard value. 
Check the following:
• Drive plate surface wear and damage
• Snap ring wear and spring retainer deformation