Extension Housing Seal

The Extension Housing Seal (T22110A) by RICHMOND is a critical wear component designed to prevent transmission fluid leakage at the extension housing, where the transmission meets the driveshaft. This compact seal serves as a barrier against fluid loss and contamination ingress, making it essential for any transmission rebuild, overhaul, or routine maintenance project. Whether you're performing a full transmission service on a street machine, weekend cruiser, or daily driver, this OEM-quality seal ensures reliable long-term performance and prevents costly fluid seepage that can compromise gear engagement and create driveway stains.

RICHMOND extension housing seals are engineered to withstand transmission fluid temperatures and pressures while maintaining a consistent grip against the housing bore and driveshaft sleeve. The seal's elastomer compound resists thermal degradation and fluid breakdown over extended service intervals, preventing the hardening or shrinkage that causes leaks in older seals. Proper installation requires careful alignment during assembly to avoid pinching or twisting, which can compromise the sealing surface and lead to premature failure. The compact 3.05-inch outer diameter and minimal 0.45-inch width make this seal suitable for tight extension housing designs found across many transmission platforms.

Mechanics and enthusiasts rebuilding manual or automatic transmissions will appreciate having this seal on hand, as it's a common preventative replacement during any major transmission service. Proper seal selection by part number ensures correct bore fit and prevents installation errors that waste labor time. This RICHMOND component is ideal for restorers, performance builders, and shop technicians who demand OEM-equivalent quality and fitment without premium pricing. Always inspect the driveshaft sleeve for scoring or wear before installation; a damaged sleeve will compromise even the best seal and require additional restoration work.