JOHNSON 0392478 Lower Unit Cylinder Spline Driveshaft 60-75HP
fits make: Evinrude, Johnson. year: 1977–1988.
( Brand: Johnson ), ( Manufacturer Part Number: 0392478 ), ( Part Type: Unit Cylinder Driveshaft )
Review JOHNSON Evinrude 60-75hp 20 Inch Lower Unit Cylinder Spline Driveshaft fits 1977–1988
The **Johnson 0392478 Evinrude 60-75HP 20 Lower Unit Cylinder Spline Driveshaft (1977 1988)** is a meticulously engineered, high-performance replacement component designed to restore optimal functionality and reliability to Evinrude outboard motors within the 60 to 75 horsepower range produced between 1977 and 1988. This driveshaft serves as a critical link between the lower unit and the propeller, ensuring seamless power transmission while withstanding the demanding forces of high-speed operation, deep-water use, and frequent exposure to saltwater corrosion. Crafted from durable, marine-grade materials, the driveshaft features a **20-cylinder spline connection**, a precise and robust design that guarantees a secure, vibration-dampening fit within the lower unit housing, preventing slippage and minimizing wear over time. Its robust construction is further enhanced by a **helical or straight spline configuration**, depending on the specific model year and application, allowing for easy installation and removal without compromising performance. Whether replacing a worn-out original driveshaft or upgrading an older engine for improved durability, this part is engineered to meet or exceed OEM specifications, ensuring compatibility with the **Evinrude 60 75HP 20 lower unit** across the specified production years. Ideal for boaters who demand both performance and longevity, this driveshaft is a straightforward yet essential upgrade that helps maintain smooth operation, reduces maintenance headaches, and extends the lifespan of your outboard motor in even the most challenging marine environments.
### **Pros and Cons of Buying a Johnson 0392478 Evinrude 60-75HP (20 Lower Unit) Cylinder Spline Driveshaft (1977 1988)**
#### **Pros:**1. **Compatibility with Classic Outboards** This driveshaft is designed specifically for Evinrude 60 75HP 20-lower-unit models from 1977 to 1988, ensuring a proper fit for restoration or replacement projects.
2. **Reliability for Vintage Boats** Johnson/Evinrude outboards from this era were known for durability, and the driveshaft is a critical component for maintaining performance in older boats.
3. **Easier to Source Than New Parts** Since these engines are no longer in production, finding original or aftermarket replacement parts can be challenging, but this driveshaft is a common repair item.
4. **Cost-Effective Alternative** Purchasing a used or refurbished driveshaft can be significantly cheaper than buying a new one, making it a practical choice for budget-conscious boat owners.
5. **Potential for Customization** If the driveshaft is in good condition, it may be possible to modify or repurpose it for other applications, depending on its structural integrity.
6. **Support for Niche Market** Buying from a seller who specializes in vintage marine parts ensures authenticity and may include additional historical or technical details about the component.
#### **Cons:**1. **Age-Related Wear** Driveshafts from this era may show signs of rust, bending, or internal damage, especially if stored improperly. A thorough inspection is necessary before purchase.
2. **Limited Availability of New Stock** Since these parts are discontinued, sourcing a high-quality replacement may require searching through salvage yards, eBay, or specialty marine suppliers.
3. **Compatibility Risks** If the driveshaft is not an exact match (e.g., slight variations in spline design or length), it may not fit perfectly, requiring additional machining or adjustments.
4. **Potential for Counterfeit or Mismatched Parts** Buyers must verify the authenticity of the part, as some sellers may offer replicas or mismatched components that could cause performance issues.
5. **Lack of Warranty or Support** Unlike new parts, used or aftermarket driveshafts typically come without warranties, meaning the buyer bears full responsibility for any failures.
6. **Installation Challenges** Older driveshafts may require specialized tools or expertise to install correctly, especially if the boat s lower unit has been modified or worn over time.
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### **Conclusion and Recommendation**
The **Johnson 0392478 Evinrude 60-75HP (20 Lower Unit) cylinder spline driveshaft (1977 1988)** is a **practical and cost-effective solution** for restoring or repairing vintage Evinrude outboards from that era. Its **direct compatibility** with classic boats makes it a strong candidate for enthusiasts working on period-correct restorations. However, **potential wear, limited availability, and the risk of mismatched parts** mean buyers must approach the purchase with caution.
**Recommendation:**- **Inspect Thoroughly Before Buying** Check for rust, bending, or internal damage. If possible, have a marine mechanic verify the driveshaft s condition.
- **Prioritize Reputable Sellers** Purchase from trusted sources (e.g., salvage yards, eBay sellers with positive feedback, or marine specialty shops) to avoid counterfeit or damaged parts.
- **Consider Newer Alternatives if Possible** If budget allows, explore **aftermarket or remanufactured driveshafts** that may offer better durability and warranties.
- **Budget for Additional Costs** Account for potential machining, installation labor, or replacement of other worn components (e.g., seals, bearings) that may be needed alongside the driveshaft.
- **Document the Purchase** Keep records of the part s origin and condition in case future issues arise.
**Final Verdict:** This driveshaft is a **good choice for experienced boat owners or restorers** who can verify its condition and ensure proper installation. For less confident buyers, a **new or remanufactured alternative** may be the safer long-term investment. Always weigh the **cost, condition, and compatibility** before finalizing the purchase.
Details:
Hi I am selling this 4 spline 20'' lower unit that was removed from a 1980johnson/evinrude 70 oil looked dirty and didn show any signs of water magnet excessive wear will fit motors 60-75 HP again is please feel free to ask all questions thanks.
part #: 0392478 prices
- $399.99-$450.00
specifications ouboaen:
- for makes: Evinrude, Johnson
- for years: 1977-1988
- brand: Johnson
- mpn: 0392478
- part type: Unit Cylinder Driveshaft
general ouboaen:
- Boat Parts > Outboard Engines Components > Complete Outboard Lower Units
- condition: Used
offer ouboaen:
- best offers: True
- sold: 0
- options: Ship-to-home
- quantity: 1
- availability: In Stock
- started: March 3, 2026
returns ouboaen:
- policy: No Returns
shipping ouboaen:
- class: Standard
- service: FedEx Ground / FedEx Home Delivery
- carrier: FedEx
- type: Fixed
- cost: $80.00
- transit: 3-8 Days
payments ouboaen:
- other
- credit card: Diners-club
- wallet: Paypal
seller ouboaen:
- city: Stuart, Florida
- # reviews: 3379
- rating: 99.1%
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