PPT has been providing both New & Remanufactured Mercruiser Sterndrives (Read More) since 2002. During this time we have established ourselves as the leading Online Supplier to the Marine Industry. However we not only supply OEM Mercruiser Sterndrives complete but also the complete Online Catalog for Mercruiser Sterndrive Parts needed for your normal Sterndrive maintenance and repairs. If you aren’t exactly certain which Alpha Sterndrive Model Gear Ratio you have this Technical Article below should help you in determining this or check out the related Technical Article for other Mercruiser Alpha Model Sterndrives.

Mercruiser Engine By Serial Number

GENERAL Since locating the original gear ratio decal on the sterndrive is not always possible, the information above defines how to determine the correct gear ratio when this information is otherwise not readily available.

Mercruiser Gear Ratio By Serial Number Search

All drive unit gear ratios are identified on each drive unit in two places. The first place to look. It will have a number such as (1.50R) and then the serial number. How to identify the gear ratio. Look on the port side of the upper housing for a serial number,around the vent plug area, under the decal maybe.For the gear ratio. My #1 problem was that I could not read the serial number on. Perhaps by an authorized Mercruiser dealer, and they had a new serial number. Gear ratio in the upper part of the leg to the next lower gear ratio to a 2.20:1,.