Helps keep automatic transmission fluid sealed at the speedometer connection with the ATP Speedometer Driven Gear Seal / Speedometer Pinion Seal (SO-13). This small but essential seal drops in as an exact-fit replacement across a broad range of 1969–1995 vehicles from American Motors, Aston Martin, Buick, Cadillac, Chevrolet and many more — see the Buyer's Guide tab for the full list.
The seal fits into the transmission case around the speedometer driven gear (pinion), where the speedometer cable enters. It stays stationary in the case and provides a fluid-tight barrier around the driven gear so ATF doesn't seep past the cable fitting. If a hardened or cracked original seal is the cause of a leak around your speedometer cable, this replaces it.
Listed under both names — Speedometer Driven Gear Seal and Speedometer Pinion Seal. Manufacturer part number SO-13.
This part cross-references / interchanges with the following part numbers:
What does the ATP SO-13 seal do?
It seals around the speedometer driven gear (pinion) where it enters the automatic transmission case, providing a fluid-tight barrier so ATF doesn't seep out past the speedometer cable fitting.
Will this fit my vehicle?
It's listed for a broad range of 1969–1995 American Motors, Aston Martin, Buick, Cadillac, Chevrolet and other vehicles. Check the Buyer's Guide tab to confirm your exact year, make and model.
What cable size does it fit?
It's sized for a 0.5-inch (1/2 in) speedometer cable and driven gear.
How do I know the seal needs replacing?
A common sign is transmission fluid seeping around the speedometer cable where it connects to the transmission. Diagnose the source first, since leaks can come from other spots.
How many do I need and where is it made?
Each listed application uses one seal, and it's made in the United States.
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.
