0389864 0434418 evinrude Johnson gearcase 20" | Genuine Used Part

🔧 Product Description

Genuine Johnson Evinrude V6 Standard-Rotation Gearcase Assembly - Part Numbers: 0389864 / 0434418

A genuine OMC complete V6 gearcase for selected 150HP to 235HP Johnson and Evinrude two-stroke outboards.

Original assembly 0389864 was carried through later service gearcase numbers including 0392627, 0398013 and 0434418. The supplied unit is described as 20-inch; this gearcase family may also be found with a 25-inch upper driveshaft, so shaft length must be measured.

⚙️ Key Features

• Genuine OMC / BRP complete V6 gearcase
• Original part number 0389864
• Later service reference 0434418
• Standard-rotation mechanical-shift configuration
• Large through-prop exhaust housing
• Suitable for selected 150HP-235HP V6 engines

🚤 Compatibility

Documented on selected

• 1979-1980 Johnson / Evinrude 150HP V6
• 1980 Evinrude 150HP, 175HP and 235HP
• 1984 Evinrude 185HP
• 1987 Evinrude 150HP
• 1990 Johnson 150HP
• Related 150HP, 175HP, 185HP, 200HP and 235HP V6 families from approximately 1979-1990
• Standard-rotation models
• 20-inch and selected 25-inch engines using the correct upper driveshaft
• Engine Type: OMC V6 carburetted two-stroke outboard
• Fitment Requirement: Confirm engine model, rotation, driveshaft length, shift-rod height and gearcase type

🔌 Function

The gearcase reduces engine speed and transmits torque through the forward and reverse bevel gears to the propeller shaft. The clutch dog selects forward, neutral or reverse.

⚠️ Common Signs of Failure

• Gearcase jumps out of gear
• Propeller shaft is bent
• Gear oil contains water or metal
• Pinion or carrier bearings are noisy
• Driveshaft spline is worn
• Housing is damaged around the skeg or carrier

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 0389864 original V6 gearcase assembly
• 0392627 related later assembly
• 0398013 related service assembly
• 0434418 later replacement / service gearcase

OEM / Related Numbers

• 0389864
• 389864
• 0392627
• 392627
• 0398013
• 398013
• 0434418
• 434418
• Related standard-rotation driveshaft and propeller shaft
• Related mechanical-shift gearcase seal and water-pump kits

Aftermarket / Verified Equivalents

• Professionally remanufactured OMC V6 lower units using the 0434418 core specification
• Specialist rebuilt 0389864 / 0434418 gearcase
• GLM and Sierra seals, pumps, bearings and internal components for the applicable V6 large gearcase
• No verified direct current new gearcase with an exact 0434418 packaged reference

📦 Condition

• Genuine used complete gearcase
• Supplied as a 20-inch unit where stated
• Removed from running engine where applicable
• In good working condition unless otherwise stated
• Pressure, vacuum and shift testing is recommended