Sierra 18-2221 Gear Set for Johnson/Evinrude Outboards 112-125 HP

The Sierra 18-2221 Gear Set is a replacement drive-train gear set built for Johnson/Evinrude (OMC/BRP) outboard motors. It is engineered to meet or exceed the quality of the original equipment gear set it replaces, giving boat owners a dependable way to restore proper shifting and power transfer in the lower unit without sourcing increasingly scarce OEM parts. The gear set is manufactured to Sierra's marine-duty standards, which means it is built to hold up to the constant load reversals, saltwater exposure, and heat cycling that outboard drive components see in service.

This gear set is designed for use with a specific range of Johnson/Evinrude outboards spanning 112 HP through 125 HP commercial models, matched to particular years and drive configurations. A companion pinion gear, Sierra 18-1288, is sold separately and is commonly installed alongside this gear set during a lower unit rebuild. Because outboard lower units use closely related gear sets across different horsepower and year combinations, it is important to confirm the exact HP, year, and model before ordering to ensure this is the correct gear set for the application.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2221
• Product Type: Gear Set
• Application: Outboard Lower Unit Drive System
• Compatible Engine Brand: Johnson/Evinrude (OMC/BRP)
• Weight: 3.85 pounds
• UPC: 030999621306
• Unit Count: 1
• Companion Pinion (sold separately): Sierra 18-1288
• Interchangeable With: GLM 22630, Mallory 9-73560

Fitment

• Johnson/Evinrude 112 HP, 1994-96, All models
• Johnson/Evinrude 115 HP, 1978-85 and 1990-98, All models
• Johnson/Evinrude 115 HP, 1999, 20 inch 60 degree V4
• Johnson/Evinrude 120 HP, 1986-92, All models
• Johnson/Evinrude 120 HP, 1993-94, TL and TX
• Johnson/Evinrude 125 HP Commercial, 1989-90

Replaces (OEM)

• GLM 22630
• Mallory 9-73560

Frequently Asked Questions

What is the Sierra 18-2221 Gear Set used for? It is a replacement gear set for the lower unit drive system of Johnson/Evinrude (OMC/BRP) outboard motors, restoring proper gear engagement and power transfer when the original gears wear out.

Which outboards does the 18-2221 gear set fit? This gear set fits Johnson/Evinrude outboards including 112 HP (1994-96, all models), 115 HP (1978-85 and 1990-98, all models, and the 1999 20 inch 60 degree V4), 120 HP (1986-92 all models, and 1993-94 TL and TX), and 125 HP Commercial models (1989-90). Confirm your engine's exact HP, year, and model before ordering.

Is the Sierra 18-2221 equivalent to any other brand's part? Yes, the Sierra 18-2221 Gear Set is interchangeable with GLM 22630 and Mallory 9-73560.

Do I need to buy the pinion gear separately? Yes, the companion pinion, Sierra 18-1288, is sold separately from the 18-2221 Gear Set and is typically replaced at the same time during a lower unit rebuild.

How much does the 18-2221 Gear Set weigh? The Sierra 18-2221 Gear Set weighs 3.85 pounds.

Is Sierra 18-2221 an OEM or aftermarket part? It is an aftermarket gear set manufactured by Sierra to meet or exceed the quality of the original equipment gear set it replaces.

How many gear sets come in one order? One Sierra 18-2221 Gear Set is included per unit ordered.

Can this gear set be used on a 1993-94 120 HP TX model? Yes, the 18-2221 Gear Set is listed for 1993-94 120 HP TL and TX Johnson/Evinrude outboards.

Will this gear set fit a 1999 115 HP outboard? It fits the 1999 115 HP Johnson/Evinrude with the 20 inch 60 degree V4 configuration; a different gear set (18-2251) is used for the 25 inch transom version of the same year and horsepower.

What should I check before ordering the 18-2221 Gear Set? Match your outboard's exact horsepower, model year, and model designation against the fitment list, since Johnson/Evinrude outboards use several closely related gear sets across similar horsepower ranges.

Does the 18-2221 Gear Set include the shift clutch? No, the shift clutch is a separate component (listed as 18-2220 or 18-2200 depending on application) from the 18-2221 Gear Set itself.