New Mercury & Mariner Outboard Replacement Gearsets

At OBParts, we supply premium replacement gearsets for Mercury and Mariner outboard engines, built to OEM specifications for durability, precision, and performance. Outboard gearsets are vital components within your lower unit, transferring engine power smoothly through the gearcase to the propeller. A worn or damaged gearset can cause excessive noise, slippage, and even major gearcase failure. Our selection includes forward, reverse, and pinion gearsets designed to fit a wide range of Mercury and Mariner outboard models. Each gearset is engineered to ensure proper alignment, exact fit, and long service life, whether you’re performing a complete gearcase rebuild or replacing individual internal parts. Trusted by marine mechanics, boat repair shops, and do-it-yourself boat owners, OBParts makes it easy to find the correct gearset for your outboard. Every part is backed by expert product knowledge, competitive pricing, a warranty, and fast nationwide shipping so you can get back on the water with confidence.

Choose OBParts for OEM-quality Mercury & Mariner gearsets and shop with confidence knowing you’re getting reliable components that keep your outboard running at peak performance.