Sonnax 77964-08K 3-4 Relay O-Ringed End Plug Kit

The Sonnax 77964-08K 3-4 Relay O-Ringed End Plug Kit is a precision-engineered valve body repair solution designed to restore hydraulic integrity in GM 4L60-E, 4L65-E, and 4L70-E automatic transmissions. This kit addresses a common failure point where the hammering effect of the 3-4 relay and/or 3-4 shift valves causes end plugs to wear, resulting in loss of critical 4th signal and D3 oil pressure.

Key Features:

• Includes 5 O-ringed end plugs and 5 O-rings (3 extra sets for future repairs)
• O-rings provide a positive seal to prevent hydraulic fluid loss
• Restores proper hydraulic integrity at the end plug location
• Prevents loss of 4th gear signal and D3 oil pressure
• Direct replacement for worn OE end plugs
• Manufactured in the United States

Each transmission unit requires 2 end plugs and O-rings for complete repair. This kit provides enough components for one complete repair with spare parts for future maintenance. Sonnax valve body components are precision-manufactured to meet or exceed OE specifications, making them a trusted choice for transmission rebuilders and professional technicians.