ATP Automatic Transmission Extension Housing Seal P/N:JO-57
Help keep automatic (and manual) transmission fluid from weeping past the tailshaft with the ATP Automatic Transmission Extension Housing Seal / Manual Trans Main Shaft Seal (JO-124). It drops in as an exact-fit replacement across a wide GM light-truck and van range plus select European applications, including the 1991-1999 Chevrolet C1500, and fits many other vehicles; see the "Vehicles it fits" section for the full list.
This seal seats in the transmission extension (tail) housing where the output shaft exits toward the driveshaft. The seal body stays stationary while its lip rides against the rotating output shaft or slip yoke, retaining transmission fluid and helping keep dirt and moisture out.
If a leak at the rear of the transmission traces to a worn extension-housing seal, this JO-124 replaces it. Listed under both names — Automatic Transmission Extension Housing Seal and Manual Trans Main Shaft Seal.
Interchange: 41711FM · 08677463 · 16450 · 4333N · 759086 · 759130
This part cross-references / interchanges with the following part numbers:
What does this seal do?
It seats in the transmission extension (tail) housing where the output shaft exits. The stationary body holds a lip that rides on the rotating output shaft or slip yoke, retaining transmission fluid and helping keep contaminants out.
How do I know this seal needs replacing?
A fluid leak or drip at the rear of the transmission, near the tailshaft/driveshaft connection, may be a sign the extension-housing seal is worn. Diagnose the source of the leak before replacing.
Why is it listed under two names?
The manufacturer calls it an Automatic Transmission Extension Housing Seal, while the catalog part type is Manual Trans Main Shaft Seal. It is known by both names and appears under each.
Will this fit my vehicle?
JO-124 is listed for a wide range of GM trucks and vans plus select European models. Check the "Vehicles it fits" section to confirm it matches your specific year, make and model.
Is this a direct replacement?
Yes. ATP lists it as an exact-fit, no-compromise replacement seal for the applications shown in the "Vehicles it fits" section.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.