Description
This transmission case seal fits the Honda Acty Truck HA3, HA4 (1990-1999). It seals the transmission case where a shaft exits so gear oil does not leak.
In Stock - ships from our California (USA) warehouse
Fast, reliable delivery - no overseas backorder wait.
Vehicle Fitment & Compatibility
Confirm your chassis code against the table below before ordering.
100% Fitment Guarantee
Not sure about fit? Add your chassis/VIN number at checkout and we confirm it before we ship. If a part does not fit your Acty, we exchange it or refund you in full.
Reasons to choose this transmission case seal
- Gear oil weeping from the transmission case
- A hardened or lipped old seal
- A drip that shows after the truck sits
- You are servicing the driveline
Features & Function
- Seals a transmission case shaft
- Correct size for the Acty transmission
- Stops gear-oil leaks
Installation Specifications
- Difficulty: Moderate.
- Estimated time: about 1 to 1.5 hours.
- Required tools: A seal puller, a seal driver, and a drain pan.
Oiwa Garage Tech Note
"This is the passenger-side rear transmission case seal. Match the exact position - rear left or right - and drive the new seal in square so the lip does not tear. Top up the gear oil after and check the level."
Frequently Asked Questions
How do I know the case seal is leaking?
Look for gear oil weeping from the transmission case at the shaft and a drip that shows after the truck sits. Clean it and drive - fresh oil returning at the seal confirms it.
Do I need to drain the gear oil?
Expect to lose some gear oil when the shaft comes out; top it up to level after fitting the seal.
Why did my old seal leak?
Age hardens the seal lip and the shaft can wear a groove; drive the new seal in square and check the shaft surface.
Fitment verified by the Kei truck specialists at Oiwa Garage · Listing updated June 2026.