Features/FAQs
Prevent transmission fluid leaks with this replacement radial lip rear seal. This dual-lip seal is engineered specifically for large-output Borg Warner T10, Super T-10 (ST10), and Richmond 4-Speed transmissions featuring an aluminum case, 9-bolt side cover, and aluminum tail housing.
Exact Part Specifications: - Outside Diameter (OD): 2.75" / 2.750 in (Fits large tail housing bore)
- Inside Diameter (ID): 1.875 in
- Width: 0.313 in
- Output Configuration: Fits 32-Spline Output Main shaft / Yoke
Commonly used in 1974-1985+ classic GM muscle cars, Corvettes, Camaros, Firebirds, and custom high-performance street rods from 1974 to 1982+ equipped with:
- Factory Borg Warner Super T10 (1974 & later heavy duty setups)
- Aftermarket Richmond Gear 4-speed performance transmissions
OEM / Interchange: 384074A, 18658, 18658CR, T10-22, SKF 18658, ST10 Rear Seal
Important Fitment Note: This seal is for the large 32-spline output shaft setup. It will not fit early-style, standard small-output T10 transmissions that use a 27-spline main shaft and smaller OD tail housing seal.
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Exact replacement part 
