The piston bore in 4T80-E units is prone to wear, either through normal operation or uneven loading from the spring. The Sonnax replacement piston 72871-01 provides more piston-to-pin support and greater durability than OE replacements.

Increased bore length for more piston-to-pin support
Machined from high-quality aluminum
More durable than OE replacements
Piston accepts standard OE or replacement seals
Drop-in Zip Valve™ parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs
The piston bore in 4T80-E units is prone to wear, either through normal operation or uneven loading from the spring. The Sonnax replacement piston 72871-01 provides more piston-to-pin support and greater durability than OE replacements.

Increased bore length for more piston-to-pin support
Machined from high-quality aluminum
More durable than OE replacements
Piston accepts standard OE or replacement seals
Drop-in Zip Valve™ parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs