4L60E, 4L65E, 4L70E

Sonnax 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 units. Vehicles with these transmissions often exhibit poor 3-4 shift quality and experience band failure in performance applications. Combine this servo kit with Sonnax 2nd gear servo # 37581K for unmatched holding power and shift performance that's an easy in-vehicle install.

• Patented dual-piston design with 40% more apply delivers greater holding power
• D-ring seals prevent pressure loss
• Use with OE, “Corvette” or Sonnax 2nd Gear servo assemblies

Contents:

• Super Hold Servo Assembly
• Steel Washer

SONNAX Installation Instructions

Sonnax 4L60E Level 3 Transmission Build