





31-32575A1 Drive Gear / Stern Drive Part for Mercury/Mercruiser & GLM / Mallory / Sierra – Fits 1963–1998
High-quality replacement Drive Gear for various Mercury/Mercruiser stern drives and compatible aftermarket brands. Precision-engineered for reliable performance and durability. Ideal for restoring your stern drive system to proper function.
Compatible with Mercury/Mercruiser, GLM, Mallory, and Sierra. Please check your OEM part numbers before purchasing.
Manufacturer Part Number: 31-32575A1
Also Fits / Alternative Numbers: 31-32575T1, GLM 21511, Mallory 9-75106, Sierra 18-1179
Part Type: Drive Gear / Stern Drive Component
Material: High-strength steel alloy (OEM spec)
Application: Stern drive unit / transom assembly
1 × Drive Gear / Stern Drive Part (OEM-quality replacement)
| Year | Model / Series | HP / Notes | Component |
|---|---|---|---|
| 1963 | Mercruiser I | Stern Drive Unit | Drive Gear |
| 1964 | 1A-1B-1C | Stern Drive IA/IB/IC | Drive Gear |
| 1965–1966 | 1A-1B-1C (EZ-SHIFT) | Stern Drive | Drive Gear |
| 1967–1969 | K20-140-160 | 120/140/160 Stern Drive | Drive Gear |
| 1970–1977 | 120/140/165 | Stern Drive | Drive Gear |
| 1971–1977 | 888 | Stern Drive (1.50 ratio) | Drive Gear |
| 1996–1997 | Alpha One Gen II | Stern Drive / Transom Assembly | Drive Gear |
| 1998+ | Alpha One Gen II | Stern Drive / Transom Assembly | Drive Gear |
| N/A | Formula I (Carburetor) | MERC Formula I | Drive Gear |
| N/A | Formula I 2L (EFI) | MERC Formula I | Drive Gear |
| N/A | Hi Perf Merc/Mar S3000 | S3000 | Drive Gear |
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