Sonnax 3rd clutch piston kit 84965-01K offers 50% more apply area than a stock piston. The increased apply area will produce a more positive shift feel and increase the life of the 3rd clutches. 

• 50% more apply area for better holding capacity
• Increased 3rd clutch durability
• Drop-in installation
• Suitable for any HD or performance application
• Hardcoat anodized for increased wear resistance

Includes:

• Piston 
• Lip Seal
• Housing with Checkball Capsule

Fits the 4t60 and 4t65e transmission.