Part Number: RTS-SMT-C4-BU

RTS Performance Transmission Extension Tail Housing - Upgraded For Ford C4/C5/C9/C10

The Ford C4 transmission has long been a favourite in performance applications, particularly drag racing, thanks to its lightweight design, simplicity, and extensive aftermarket support.

RTS is proud to introduce its all-new Ford C4 extension housing, engineered to address the shortcomings of the original factory unit while offering improved durability and performance. Whether you're replacing a worn, cracked, or warped OEM housing or upgrading a high-performance transmission build, this extension housing delivers the strength and reliability required for both street and race applications.

Designed as a direct replacement for the factory housing, it also perfectly complements the upcoming RTS Ford C4 transmission case which is currently in production.

Features:

• Low-pressure cast for increased strength compared to the factory die-cast housing
• Manufactured from premium A356-T6 heat-treated aluminium
• Reinforced rear seal flange area to reduce the risk of cracking
• Increased mounting flange thickness to minimise distortion under load
• Larger gasket sealing surface designed to match the upcoming RTS C4 case
• 1/8" NPT breather port, ready for a remote breather or catch can installation
• Supplied with rear bush and seal pre-installed for added convenience
• Direct OEM replacement with improved strength and durability

Designed as a direct OEM replacement or performance upgrade, this housing pairs seamlessly with the soon-to-be-released RTS Ford C4 transmission.