Sonnax 77701-04K 2nd Gear Corvette Ratio Servo Kit for GM 4L60 4L60-E 4L65-E 4L70-E

The Sonnax 2nd Gear "Corvette" ratio servo kit 77701-04K provides increased apply area resulting in improved holding power for firmer 1-2 and 3-4 shifts in 4L60 (700-R4) and 4L60-E transmissions. This 0.74 ratio servo delivers firmer 1-2 and 2-3 shifts, making it ideal for high performance and heavy-duty towing applications where enhanced shift quality and band holding power are critical.

Key Features:

• Upgraded Viton D-rings replace OE seal rings for improved sealing during apply and release
• Improved holding power for wide range of street applications
• Increased apply area for greater band clamping force
• Compatible with Sonnax 4th Gear Super Hold dual servo kits
• Direct replacement for OE 2nd gear servo assembly

Kit Contents:

• Servo piston
• 2 piston D-rings
• Servo housing
• Housing O-ring

This kit fits 4L60-E, 4L65-E, and 4L70-E transmissions, making it a versatile upgrade for GM automatic transmission rebuilds. The improved sealing configuration helps prevent pressure loss during shifts, resulting in more consistent transmission performance and extended component life in demanding applications.