0432624 Johnson 20" Gearbox Complete | Genuine Used Part

🔧 Product Description

Genuine Johnson Evinrude 50HP-70HP 20-Inch Gearcase Assembly - Part Number: 0432624

A genuine OMC / BRP complete long-shaft lower unit for selected 50HP to 70HP three-cylinder outboards.

This later small-gearcase assembly uses a 2.42:1 reduction ratio, a 17-spline driveshaft and a 13-spline propeller shaft. It is commonly supplied for 20-inch transom engines built from the late 1980s through approximately 2001.

⚙️ Key Features

• Genuine OMC / BRP complete gearcase
• Correct part number 0432624 / 432624
• 20-inch long-shaft configuration
• 2.42:1 gear ratio
• 17-spline driveshaft
• 13-spline propeller shaft
• Mechanical shift and through-prop exhaust

🚤 Compatibility

Documented on selected

• Johnson / Evinrude 50HP three-cylinder
• Johnson / Evinrude 55HP
• Johnson / Evinrude 60HP
• Johnson / Evinrude 65HP
• Johnson / Evinrude 70HP
• Approximately 1989-2001 model families using the later 17-spline small gearcase
• Standard Johnson and Evinrude 20-inch remote-control models
• Commercial or special models only where the same ratio and spline configuration are specified
• Shaft Length: 20 inch
• Gear Ratio: 2.42:1
• Driveshaft: 17 spline
• Propeller Shaft: 13 spline
• Approximate driveshaft length from case to tip: 21.5 inches
• Fitment Requirement: Confirm ratio, spline count and shift-rod height

🔌 Function

The lower unit reduces engine speed by 2.42:1 and transfers torque to the propeller shaft while providing forward, neutral and reverse.

⚠️ Common Signs of Failure

• Unit jumps out of gear
• Gear oil contains water or metal
• Driveshaft or propeller-shaft splines are damaged
• Bearing noise increases under load
• Propeller shaft is bent
• Water-pump output is weak

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 0432624 original complete-gearcase reference
• 0765397 / 765397 related BRP remanufactured or service replacement reference

OEM / Related Numbers

• 0432624
• 432624
• 0765397
• 765397
• Related 20-inch driveshaft, shift rod and water-pump assembly
• Related small-hub gearcase seal kit

Aftermarket / Verified Equivalents

• BRP remanufactured lower unit 0765397 / 765397 where catalogued
• Specialist rebuilt 0432624 gearcase
• Remanufactured 50HP-70HP 2.42:1 OMC lower units
• Sierra and GLM water-pump and seal components
• No verified mass-produced new complete aftermarket gearcase

📦 Condition

• Genuine used complete gearcase
• Removed from running engine where applicable
• In good working condition unless otherwise stated
• Pressure, vacuum and gear-engagement testing is recommended