SEI SE304 V4 Gearcase – Replacement Johnson/Evinrude Lower Unit (85–140HP, 1978–1998, 2.0:1 Ratio, Aftermarket)

SEI SE305 V4 Gearcase – Replacement Johnson/Evinrude Lower Unit (1995–2012, 75–130HP, 2.0:1 Ratio)

The SEI SE305 V4 Gearcase is a premium aftermarket replacement lower unit
for Johnson and Evinrude outboard motors. Specifically designed to replace
most later-model V4 lower units (75–130HP, 1995–2012), this gearcase is engineered
with a 2.0:1 gear ratio, a 4-1/8″ bullet diameter,
and a durable black finish that can be painted to match your motor.

Key Features:

• Direct replacement for Johnson/Evinrude V4 outboards (75–130HP, 1995–2012)
• 2.0:1 gear ratio for smooth and reliable performance
• 4-1/8″ bullet diameter design
• Equipped with external water screens for improved cooling
• Flat cavitation plate at the rear
• Black factory finish (paintable to match your engine)

Important Notes:

• Upper driveshaft not included. If your old unit has a one-piece shaft, you must purchase a new upper driveshaft (see optional shafts below).
• Uses the newer style stub-shaft with clip. If your upper shaft is not the newer clip-style, it will need to be replaced.
• On 2007 and newer 115HP & 130HP motors, you must remove the clips on the driveshaft before installation.
• Water pump not included. A compatible Water Pump Kit is available separately.
• Shift shaft not included. Reuse and adjust your existing shift shaft during installation.

Why Choose the SEI SE305?

The SEI SE305 aftermarket gearcase provides a cost-effective, high-quality alternative
to OEM Johnson/Evinrude lower units. Designed for V4 outboards (75–130HP, 1995–2012),
it ensures reliability, long-lasting durability, and excellent performance on the water.
Ideal for boaters who demand trusted replacement parts at the best value.

Need Help?

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