P/N SEI-106-1.98
- Mercruiser R/MR/Alpha One Gen 1 complete upper unit.
- For 1970 – 1990 models, 4 cylinder
- 1.94 / 1.98 gear ratios with
20-24 tooth count - Compatible with 120 to 140 horsepower models with a 2.5 or 3.0 liter motor
- Years 1971 to 1990, serial numbers 2791957 to 6225576
*Note – before ordering, please measure your output shaft that goes into the engine. Replacement upper units come with an output shaft that measures 9-9/16 inch. If your shaft is the ‘short style’ which measures 8-1/8 inches, please contact order desk for availability.