SEI SE308 Johnson Evinrude Counter-Rotation Lower Unit 1.83:1The SEI 90-308-B SE308 is an aftermarket replacement lower unit for select Johnson and Evinrude outboards requiring counter rotation. Featuring a 1.83:1 gear ratio, it carries OE reference number 5009324. Upper driveshaft and propeller thrust washer requirements vary by engine application.This item is subject to a 20% restocking fee.Year, serial number, and horsepower are required to process your order. Please contact us with this information after placing your order. Processing will be delayed until this information is received.Features Counter-rotation configuration; 1.83:1 gear ratio; Replacement gearcase for compatible Johnson and Evinrude outboards; OE reference: 5009324; Fitment and InstallationUpper driveshaft selection depends on your exact engine model and shaft length. Listed 19881992 applications require purchasing the appropriate upper driveshaft. Check SEI's application guide for the correct shaft and any model-specific installation requirements.Propeller Thrust Washer RequirementsListed 19881990 applications require a different propeller thrust washer: Three-blade OMC propellers: SEI 98-306-40; Four-blade propellers: OEM 0126869; Color AvailabilitySEI is transitioning lower units to black. Actual color may vary depending on inventory available at the time of your order.Confirm your exact engine model, serial number, rotation, shaft length, and upper driveshaft requirements against SEI's application guide before ordering. Horsepower and year alone do not confirm compatibility.