Drive specs Specifications for OMC Stringer 400 Model years 1978–1985 Type Drives
About the drive The Stringer 400 is the version for four-cylinder engines. Hydraulically assisted shifting (1978–1981) was replaced by mechanical shifting in 1982. The model also appears as OMC 400, 400-serien, OMC Stringer.
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Drive specs Gear ratios 2.00:1 (lower) Upper gear unit Upper gear varies by engine Propeller system Single propeller
Lower unit variants
Service points Drive oil: change it and check that it isn't milky (water) Sacrificial anodes Propeller and propeller shaft seals How to identify the drive OMC Stringer 400 Small lower gear housing for four-cylinder engine Mechanical shift (1978–1985) Ball gears instead of a U-joint Engine and drive are trimmed together Check the model and serial numbers, not just the engine's output. Tell the Stringer (beam mounting and ball-type gears) apart from the Cobra (transom mounting, U-joint and trim cylinders). 400/800 denote small and large gear housings respectively.
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Official identification charts Mariner's Warehouse: How to identify an OMC Cobra lower unit (marinerswarehouse.com) marinerswarehouse.com · HTML
How to tell Cobra gear housings apart.
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