Sonnax 77767K 4th Gear Super Hold Dual Servo Kit for GM 700R4 4L60 4L60E 4L65E 4L70E

The Sonnax 77767K 4th Gear Super Hold Dual Servo Kit features 40% more apply surface area for greater holding power in GM 4L60 (700-R4), 4L60-E, 4L65-E and 4L70-E transmissions. Vehicles with these transmissions often exhibit poor 3-4 shift quality and experience band failure in performance applications. This high-performance servo kit is engineered to address these common issues with a patented dual-piston design.

Key Features:

• Patented dual-piston design with 40% more apply surface area delivers greater holding power
• Manufactured from anodized billet aluminum for superior strength and durability
• Upgraded Viton D-ring seals prevent pressure loss
• Affects 4th gear only
• Can be used with OEM, Corvette or Sonnax performance 2nd gear servo assemblies
• Easy to install without removing the transmission from the vehicle
• Provides firmer 3-4 shift quality
• Excellent choice for vehicles used for highway towing

Kit includes 4th gear piston, housing, and seals. Combine this servo kit with Sonnax 2nd gear servo 77911-03K for unmatched holding power and shift performance. This upgrade is ideal for performance applications, towing, and street/strip vehicles that demand reliable band apply and superior shift quality.