Sonnax 77767K-SK Replacement Seal Kit for 4th Gear Servo GM 4L60 4L60-E 4L65-E 4L70-E

The Sonnax 77767K-SK replacement seal kit is designed to refresh worn or damaged seals in the Sonnax 4th Gear Super-Hold dual servo kit (part number 77767K). This seal kit is essential for maintaining optimal performance in GM 4L60 (700-R4), 4L60-E, 4L65-E, and 4L70-E automatic transmissions.

Kit Includes:

• Two Viton D-ring seals for superior heat resistance and durability
• Two O-ring seals for proper sealing and pressure retention

These upgraded PTFE seals feature an improved design that helps conserve pump volume while preventing pressure loss during servo apply and release cycles. The Viton material construction provides excellent resistance to transmission fluid and high temperatures, ensuring long-lasting performance in both street and high-performance applications.

This seal kit allows you to rebuild and extend the life of your Sonnax 77767K servo assembly without purchasing a complete new unit, making it a cost-effective maintenance solution for transmission rebuilders and performance enthusiasts.