SEI 106-1.98 Upper gearcase Alpha one

Description

SEI 106-1.98

Mercruiser and Alpha One aftermarket replacement upper unit.

SEI marine upper gearcase compatible with years 1970 to 1990 models.

4 cylinder engines with 1.94 / 1.98 gear ratios with a 20 – 24 tooth count.

Works with 120 to 140 horsepower models with a 2.5 or 3.0 liter motor, 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 us for availability.