MerCruiser Alpha One Lower Unit Counter Rotation Gearcase 3.0L 4.1L 5.0L 5.7L Gen I 1983-1990

Item Details This is a counter rotating unit.  Usually only found on boats with twin engines.  Impeller will need to be inspected.  Will come with an impeller kit. Compatible with all upper alpha one Units (MC-1/R/MR/Gen 1) from 1970-1990 (the case style is 1983-1990) Regardless of engine (120hp 2.5L 140hp 3.0L 165hp 170hp 305 350 470 2.5L 3.0L 4.3L V6 5.0L 305 5.7L 350 V8 etc) Shifts and functions as it should. All shafts are pretty clean and not rusted up. No leaks or bad seals found after pressure testing. Gear oil will be drained before shipping. No Cracks or Welds Purchase with confidence!