Billet Aluminum FWD / Direct Piston .625" Tall w/ Checkball

TH400 BILLET ALUMINUM PISTON, FWD/DIRECT .625" TALL W/ CHECK BALL

The Coan Racing COA‑22830 TH400 Billet Aluminum Forward/Direct Piston (.625″ Tall) with Check Ball is a precision-engineered upgrade designed to replace the standard cast piston. Machined from high-strength billet aluminum in the USA, this piston offers increased durability and tighter sealing under hard-driving conditions. Its .625″ height restores hydraulic capacity optimally for TH400 setups, while the integrated check ball ensures precise fluid control and consistent clutch engagement under pressure.

As a direct-fit component, the COA‑22830 installs effortlessly into stock-style drums and integrates seamlessly with Coan’s clutch plate kits, avoiding the need for machining or case modifications. With enhanced rigidity, leak resistance, and hydraulic stability, this piston is ideal for drag, bracket, and performance street applications where reliable front-end durability is essential.