SEI has been in the stern drive business since 2003. Hit a rock, suck up some fishing line, drag the gearcase up the boat launch by mistake, it does not matter, the gearcase will be covered by SEI's fault-free warranty. SEI's Gearcases come with a three-year, fault-free warranty which means that the gearcase will be covered for any failure that requires the gearcase to be replaced or repaired. SEI operates one of the world's only research lakes dedicated to the testing of marine propulsion systems. As for quality, SEI's Gearcases are thoroughly tested for both performance and endurance. SEI also avoids using distributors thus reduces the company's costs at getting the product into the hands of the boat owner. Eliminating the middleman reduces SEI's costs and these savings are passed on to the customer. The parts come directly from suppliers around the world made to SEI's exact and precise specifications. SEI's Gearcases are assembled at our factory in Clearwater, Florida. Often SEI is asked about the quality of our gearcases and how the company is able to offer such a product at a fraction of the OEM price.

SEI’s gearcases replace most V6 outboards from 1980 to present. SEI is currently producing gearcases for V6 outboards. The gearcases offered by SEI are fully compatible and interchangeable with Mercury, Yamaha and Johnson Evinrude gearcases. SEI has engineered replacement gearcases for Mercury, Yamaha and Johnson Evinrude.

Gearbox Manual Perdana Sei