Transmission Internals

Transmission Internals & Hard Parts

Transmission internals include the gears, shafts, synchros, clutch packs, bands, and hard parts inside the transmission that transfer power from the engine to the wheels. Upgraded internals handle more torque and higher RPM than factory components, making them essential for high-horsepower builds that exceed the factory transmission’s capacity.

OneFastShop carries transmission internals including upgraded gear sets, billet shafts, high-capacity clutch packs, performance bands, valve body kits, and direct-fit internal upgrades for popular automatic and manual transmissions.

Every transmission internal at OneFastShop ships brand-new with manufacturer warranty coverage. Whether you're strengthening a transmission for more power, rebuilding with upgraded internals, or replacing a failed hard part, OneFastShop has the component. Shop the full transmission internals collection today.