External leaks and lost line pressure both trace back to gaskets and seals that hardened with age and heat.C4 C4 C5 extension housing 86 gasket. This set covers the gaskets, seals and o-rings a rebuild replaces to restore fluid containment and hydraulic pressure.The rubber is rated for the fluid the unit runs, so it stays pliable instead of hardening in the first heat cycle. Shipping weight is 1 lb.This listing covers the c4 c5 extension housing 86 gasket only. The parts list below is exactly what ships. Compare it against your teardown before ordering.REMCO has supplied automatic transmission parts since 1991, and every order ships with its part listing so the receiving technician can check what arrived against what was ordered. Transmission Gasket for C4 - replacement component designed for proper fit and function Designed to support proper case sealing, port isolation and fluid retention during a reseal Package Includes: one transmission gasket as described, supplied loose for a reseal Gasket material cut to the original bolt pattern and port layout - designed for dependable service in the intended application. Ships at 1.00 lb, 11x9x1 in Intended for shops resealing the unit. Clean both surfaces to bare metal and torque in sequence to the service manual figure