Mercury & Mariner Outboard Gearcase Rebuild Kits

Unlock superior performance with OBParts’ outboard gearcase rebuild kits. Whether you're maintaining a Mercury or Mariner engine, our kits provide every essential part—gears, bearings, seals, and more—for a smooth rebuild experience. Select from a range of configurations tailored to your specific horsepower, cylinder count, and engine model. With premium components built for durability and backed by a warranty, OBParts ensures you get your boat back on the water fast and confidently.