Volvo Penta Gear (23 Tooth / 1.78 Ratio) – OEM Part # 3851203 / 21130692
You are purchasing a genuine Volvo Penta OEM Pinion Gear, part numbers 3851203 (earlier OEM revision) and 21130692 (current superseding OEM revision — same gear), removed from a sterndrive upper gear unit in good usable condition. This is the 23-tooth pinion gear used in 1.78 ratio applications across the SX-M and DP-SM sterndrive family. Good gear teeth — please review all photos carefully.
Cross-Reference / Supersede Chain:
- 3851203 (earlier OEM revision — this part)
- 21130692 (current superseding OEM revision — same part)
Note: The 3851203 pinion is used across multiple gear ratios in the SX-M/DP-SM family (1.43, 1.51, 1.60, 1.66, 1.68, 1.78, 1.89, 1.95, 2.18). The 23-tooth / 1.78 ratio is confirmed for this listing. The companion driven/ring gears are separate part numbers — not included.
Fitment: Fits Volvo Penta SX-M and DP-SM sterndrive upper gear housings with 1.78 gear ratio, including but not limited to:
- SX-M (1.78 ratio)
- DP-SM (1.78 ratio)
Please verify your drive model, serial number, and current gear ratio before purchasing. If you are unsure, send us a message with your drive model and ratio and we will do our best to help confirm compatibility.
Condition: Used, in good working condition. Normal signs of wear consistent with age and use. Please review all photos carefully — they are part of the description and show the actual item you will receive.
Shipping: Item ships quickly after payment is received. All items are carefully packaged to prevent damage in transit. Combined shipping is available on multiple purchases.
Questions? Message us anytime. We specialize in used marine engine and outboard parts and are happy to help you find what you need. Thank you for looking!
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