Heavy Duty Lower Unit Assembly With Long Drive Shaft For 40HP Outboard Engine Compatible With 40G And 40J Models Bare Knuckle Marine Build No Sweat Setup Ready To Conquer The Waves

1 Pack Heavy Duty 40HP Outboard Lower Unit Assembly
✔️ Fits 40G J drives, matches 6J4-45300 standard, adds long shaft

This heavy duty lower unit assembly replaces worn gear casings on 40 horsepower outboards. Boat owners use it to restore propulsion power during dockside repairs or seasonal maintenance. The extended drive shaft configuration aligns directly with standard motor mounts for quick bench swaps.

✅ Direct replacement for 40HP model drivetrains
✅ Corrosion resistant housing blocks saltwater degradation
✅ Longer output shaft simplifies engine alignment procedures
✅ Certified to 6J4-45300 and 6J4-45300-00 technical standards

💡 Why are aftermarket lower unit assemblies handy for aging outboards?
Swapping the gear box restores proper trim operation and stops coolant leaks. Pick the exact match by reviewing these specs.
- Match the spline count to your driveshaft diameter
- Align the gear ratio with stock horsepower ratings
- Confirm the water intake screen fits the cooling system
- Lubricate the universal joint cup before torquing down

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