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MerCruiser Alpha Gear Tooth Ratio Chart Made Easy – Full Chart Inside

MerCruiser Alpha Gear Tooth Ratio Chart Made Easy – Full Chart Inside

If you’re trying to identify the correct gear ratio for your MerCruiser Alpha One, Alpha One Gen 2, or even earlier R-style sterndrives, this gear ratio chart will help you quickly match engine specs to gear ratios and tooth counts. Whether you're searching for the MerCruiser Alpha One Gen 2 gear ratio chart, the Alpha One gear ratio, or how to find gear ratio on a MerCruiser outdrive, this guide provides a complete breakdown of gear ratios by engine type, horsepower, cylinder count, and model year.

Use this chart to compare Alpha 1 Gen 1 gear ratios and Alpha 1 Gen 2 gear ratios, or reference specific configurations like the MerCruiser gear ratio by serial number.

From 3.0L to 5.7L models, and everything in between, this is your go-to MerCruiser gear ratio chart for fast and accurate identification.

Mercruiser R-Style Sterndrives (1969 – 1983)

Engine HP Liters/CID Cylinders Gear Ratio Tooth Count Year
2.5 Liter 120 2.5/153 4 1.98 20-24 1969-1983
2.5 Liter 130 2.5/153 4 1.98 20-24 1969-1983
165 165 3.7/224 6 1.65 24-24 1969-1983
470 170 – 190 4.3/262 4 1.84 17-19 1969-1983
215 – 233 205 – 230 351 8 1.5 20-22 1969-1983
260 260 5.7/350 8 1.5 20-22 1969-1983

Mercruiser Alpha 1 (1984 – 1990 Models)

Engine HP Liters/CID Cylinders Gear Ratio Tooth Count Year
2.5 Liter 120 2.5/153 4 1.98 20-24 1984-1990
3 Liter 130 3.0/181 4 1.98 20-24 1984-1990
165 165 3.7/224 4 1.84 17-19 1984-1990
175 175 4.3/262 6 1.84 17-19 1984-1990
180, 190, 470 180 3.7/224 4 1.84 17-19 1984-1990
200 200 5.0/305 8 1.65 24-24 1984-1990
205 205 4.3/262 6 1.84 17-19 1984-1990
230 230 5.0/305 8 1.5 20-22 1984-1990
260 260 5.7/350 8 1.5 20-22 1984-1990
350 Magnum 270 5.7/350 8 1.5 20-22 1984-1990

Mercruiser Alpha 1 Gen 2 (1991 & Newer)

Engine HP Liters/CID Cylinders Gear Ratio Tooth Count Year
3 Liter 130 3.0/181 4 2.0 24-24 1998-2005
3 Liter 130 3.0/181 4 1.94 20-24 1991-2005
4.3 Liter 175 4.3/262 6 1.81 17-19 1991-2005
5.0 Liter 230 5.0/305 8 1.61 24-24 1991-2005
5.7 Liter 260 5.7/350 8 1.47 20-22 1991-2005

Final Tips on Finding the Right MerCruiser Gear Ratio

Still unsure or want to double-check your setup? You can also reference your MerCruiser serial number or consult your engine’s service manual for confirmation.

And if you need help, give us a call at 1-856-232-6969 — we're happy to assist.

Bookmark this page or share it with fellow boaters — having the right MerCruiser gear ratio chart on hand saves time and avoids costly mistakes.

August 23, 2024 PowerBoatSupply Team

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