Description
B-Series Transmission Plate M, Oil Guide
The 21104-PS1-020 is the OEM “Plate M, Oil Guide” used in Honda/Acura B-series manual transmissions. It directs oil flow inside the transmission housing to ensure proper lubrication of internal components. Over time, the original guide plates can crack or warp, leading to poor lubrication and increased wear. Replacing it restores correct oil routing and helps maintain transmission health — essential for restoration projects or rebuilds.
Factory Part Number: 21104-PS1-020
Replaces: 21104-PS1-010
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