HARLEY-DAVIDSON 34707-89 Transmission Gears

( Brand: Harley-davidson ), ( Manufacturer Part Number: 34707-89 ), ( Type: Transmission )

Review HARLEY DAVIDSON Transmission Speed Case And Gears Condition fits SOFTAIL 1990–1999

The **Harley-Davidson 34707-89 Transmission Gears (Models 90-99 Softail)** represent a critical, high-performance component designed exclusively for the iconic **Softail series** produced between **1990 and 1999**. These gears are a precision-engineered set tailored to the **Evo 883cc and Evolution II 96ci engines**, ensuring seamless power delivery and optimal durability under the demanding conditions of high-performance riding. Crafted from **high-grade alloy steel**, these gears are heat-treated and machined to Harley-Davidson s exacting standards, guaranteeing smooth engagement, reduced wear, and extended longevity of the transmission system. The **34707-89 set** includes the **input, output, countershaft, and reverse gears**, all meticulously balanced to minimize vibration and noise while maximizing torque transfer essential for maintaining the raw, unfiltered power characteristic of Harley-Davidson s legendary V-twin engines. Whether restoring a classic Softail or upgrading an existing build, these gears are a **direct-fit, OEM-quality replacement**, designed to restore factory performance or enhance reliability in a modified setup. Their robust construction and compatibility with the **90-99 Softail s drivetrain** make them an indispensable choice for riders seeking both authenticity and performance, ensuring that every gear shift remains crisp, every mile ridden feels purposeful, and the engine s legendary growl remains uncompromised.

### **Pros and Cons of Buying Harley-Davidson 34707-89 (1990-1999 Softail) Transmission Gears**

1. **Compatibility and Fitment** These gears are specifically designed for Harley-Davidson Softail models from 1990 to 1999, ensuring a perfect fit without modification. They are a direct replacement for the stock transmission gears, which may wear out over time.

2. **Improved Performance** Worn or damaged gears can cause rough shifting, grinding, or even failure. Replacing them with new or high-quality aftermarket gears can restore smooth shifting, reduce wear on other transmission components, and improve overall drivability.

3. **Extended Transmission Lifespan** Transmission gears are subject to high stress and friction, leading to pitting, scoring, or breakage. Replacing them prevents further damage to the transmission housing, synchronizers, and other internal parts, potentially saving costly repairs later.

4. **Better Shift Quality** Stock gears may develop uneven wear, causing hesitation or difficulty in shifting. New gears ensure consistent engagement, making gear changes smoother and more responsive.

5. **Cost-Effective Maintenance** While not the cheapest transmission component, replacing gears is significantly less expensive than a full transmission rebuild or replacement. It s a targeted fix rather than a complete overhaul.

6. **Availability of Aftermarket Options** Beyond OEM parts, aftermarket brands (such as **Eagle, Torque, or Harley-Davidson Performance Parts**) offer upgraded gears with improved durability, better heat resistance, or lighter weight for better performance.

7. **Prevents Catastrophic Failure** A seized or broken gear can lead to a complete transmission failure, stranding you on the side of the road. Replacing them proactively avoids such risks, especially for high-mileage bikes.

8. **Easier Installation** Unlike some transmission overhauls, gear replacement is relatively straightforward for a mechanic with basic tools. It typically requires draining the transmission fluid, removing the transmission cover, and swapping out the worn gears.

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1. **Cost** While cheaper than a full transmission rebuild, new OEM or aftermarket gears can still be expensive, ranging from **$200 to $600 **, depending on the brand and whether you include installation labor. Aftermarket options may offer better value but vary in quality.

2. **Labor Dependency** If you re not mechanically inclined, you ll need a shop to perform the replacement. Transmission work can be time-consuming, and some mechanics may charge premium rates for Harley-Davidson repairs.

3. **Potential for Other Transmission Issues** Even with new gears, other transmission components (such as synchronizers, bearings, or the input shaft) may be worn. If these aren t addressed, the problem could recur or worsen.

4. **Limited Longevity of Aftermarket Parts** Some budget aftermarket gears may not last as long as OEM parts, especially under heavy use or in extreme conditions. Higher-end aftermarket brands (e.g., **Eagle Torque**) are more reliable but cost more.

5. **Mismatched Wear Patterns** If only the gears are replaced without checking the rest of the transmission, other parts (like the input shaft or countershaft) may still be worn, leading to premature failure of the new gears.

6. **Time Off the Bike** The process requires draining transmission fluid, removing the transmission cover, and possibly the entire transmission for a full inspection. This can take **4-8 hours** of labor, depending on the bike s condition.

7. **Risk of Incorrect Installation** If not installed properly, new gears can cause binding, improper meshing, or even damage to the transmission housing. This risk is higher if attempting a DIY install without proper guidance.

8. **Fluid Contamination** Old transmission fluid can contain metal shavings from worn gears, which may contaminate new gears during installation. This is why it s recommended to flush the transmission fluid before replacing gears.

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### **Conclusion**

Replacing the transmission gears on a **1990-1999 Harley-Davidson Softail** is a **smart preventive maintenance move** if you notice rough shifting, grinding, or hesitation. The benefits **smoother operation, extended transmission life, and avoidance of catastrophic failure** far outweigh the drawbacks, provided the work is done correctly.

However, the **cost, labor requirements, and potential for underlying transmission issues** mean it s not a decision to take lightly. If your bike has high mileage or shows signs of **fluid leaks, rough shifting, or unusual noises**, it may be worth considering a **full transmission inspection or rebuild** alongside gear replacement to ensure long-term reliability.

For most riders, **prioritizing gear replacement over a full rebuild is the most cost-effective solution**, especially if the rest of the transmission appears healthy. If you re unsure, consulting a **Harley-Davidson specialist** can help determine whether this is the best fix or if deeper repairs are needed.

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### **Recommendation**

- **Buy new OEM or high-quality aftermarket gears** (e.g., **Eagle Torque or Harley-Davidson Performance Parts**).

- **Flush the transmission fluid** before installation to prevent contamination.

- **Have a mechanic perform the replacement** to ensure proper alignment and lubrication.

- **Get a full transmission inspection** before replacing just the gears. A rebuild may be necessary if synchronizers, bearings, or the input shaft are worn.

- **Consider upgrading to aftermarket gears** if you plan to keep the bike long-term, as they often outlast OEM parts.

- **Attempt a DIY install** if you have experience with transmission work. Use a **Harley-Davidson service manual** and **proper tools** (torque wrench, gear puller, etc.).

- **Check for cross-training issues** some aftermarket gears may require modified synchronizers or shafts.

- If cost is a concern, **prioritize the gears and fluid change** first, then address other transmission components in subsequent steps.

- **Shop around for parts** some mechanics or online retailers offer discounts on gear sets.

**Final Verdict:** **Yes, replacing these gears is a worthwhile investment** if your transmission is otherwise in decent shape. It s a **proactive fix** that prevents bigger problems down the road. Just ensure the work is done correctly to maximize longevity.

Details:

The operating condition is unknown. Removed From: 1995 Harley-Davidson Softail with unknown miles, Please review all pictures to assess the condition of item. 90-99 Harley Softail Transmission 5 Speed Case and Gears Unknown Condition, This transmission has damage is being sold for parts only. The case appears to be aftermarket.

The gears spin freely and the shift forks move. This is a used part and may have scratches scuff, corrosion, wear, etc. Every effort has been made to accurately depict and describe the condition of this part.

part #: 3470789 prices

• $250.00-$1244.95

specifications transmissioncycleoi:

• for models: Softail
• for makes: Harley
• for years: 1990-1999
• brand: Harley-davidson
• mpn: 34707-89
• type: Transmission

payments transmissioncycleoi:

• other
• wallet: Google-pay
• credit card: Diners-club

general transmissioncycleoi:

• Motorcycle Scooter Parts Accessories > Transmission Drivetrain > Other Transmission Drivetrain Parts
• condition: For parts or not working

seller transmissioncycleoi:

• rating: 99.9%
• # reviews: 2200
• city: Lake Odessa, Michigan

shipping transmissioncycleoi:

• type: Fixed
• class: Standard
• cost: $0.00
• service: USPS Ground Advantage
• carrier: USPS
• transit: 4-8 Days

returns transmissioncycleoi:

• time: 30 Days
• paid by: Buyer
• policy: Returns Accepted

offer transmissioncycleoi:

• best offers: True
• sold: 0
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• started: February 16, 2026

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