ULTIMA UC710223 Transmission Fxst

( Brand: Ultima ), ( Manufacturer Part Number: UC710223 ), ( Part Type: Transmission ), ( Made To Fit: Harley Davidson ), ( Manufacturer Warranty: No ), ( Size: 6 Speed ), ( Material: Chrome ), ( Country Of Origin: United States )

Review ULTIMA Speed Transmission Harley Fxst fits SOFTAIL HERITAGE FAT BOY

The **Ultima UC710223 Transmission for Harley-Davidson Softail FXST Heritage and Fat Boy Models** represents a premium, high-performance upgrade designed to elevate the drivetrain experience of these iconic American muscle bikes. Engineered with meticulous attention to detail, this transmission is crafted to deliver seamless shifting, enhanced durability, and a refined power delivery that complements the raw torque and deep-throated growl of Harley s legendary V-twin engines. Built using precision-machined components and fortified with high-grade materials, including hardened steel gears and optimized bearings, this transmission ensures smooth operation under the demanding conditions of daily riding, long-distance cruising, and spirited acceleration. The UC710223 is specifically tailored to fit the FXST Heritage and Fat Boy models, offering an exact match to OEM specifications while incorporating subtle yet significant improvements such as reduced friction points and optimized gear ratios that enhance efficiency and responsiveness. Whether you re navigating winding backroads, cruising along scenic highways, or simply enjoying the unmistakable presence of your Harley, this transmission ensures a more engaging and reliable ride. Backed by Ultima s reputation for quality and performance, this upgrade is ideal for riders seeking to preserve the authenticity of their bike s heritage while unlocking a new level of drivetrain performance.

### **Pros and Cons of Buying a Harley-Davidson Softail Transmission (UC710223) Heritage Softail FXST/Fat Boy**

#### **Pros**

1. **Enhanced Driving Experience** The UC710223 transmission replaces the traditional belt drive with a traditional gearbox, offering smoother, more responsive shifting and better torque delivery, especially in stop-and-go traffic or low-speed maneuvers.

2. **Improved Reliability** Gear-driven transmissions are generally more durable than belt drives, reducing the risk of belt wear, stretch, or failure, which can be a common issue in Harley s belt-drive models.

3. **Better Fuel Efficiency** A gearbox allows for more efficient power transfer, particularly in city driving, where the belt drive can lose some efficiency due to slippage.

4. **Traditional Harley Feel** Many riders prefer the tactile feedback and engagement of a traditional gearbox, which some argue provides a more "authentic" Harley experience compared to the belt drive.

5. **Compatibility with Modifications** Some aftermarket modifications (such as torque converters or performance exhaust systems) work better with a gearbox setup.

6. **Potential for Lower Maintenance Costs** While initial installation can be expensive, a gearbox may reduce long-term maintenance costs associated with belt replacements and adjustments.

7. **Better Cold-Weather Performance** Belt drives can sometimes lose power in cold conditions due to reduced elasticity, whereas a gearbox maintains consistent performance.

8. **Resale Value for Enthusiasts** Riders who prefer traditional transmissions may find the UC710223 more appealing, potentially improving resale value among that demographic.

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#### **Cons**

1. **High Upfront Cost** The UC710223 transmission is a significant aftermarket modification, often costing **$3,000 $5,000 ** installed, depending on labor and additional components needed (such as a torque converter or clutch).

2. **Complex Installation** Requires professional installation, as it involves removing the engine, adjusting the drivetrain, and ensuring proper alignment. DIY attempts are not recommended.

3. **Potential for Increased Weight** A gearbox adds weight to the bike, which may slightly reduce handling agility, though the difference is minimal on a heavy bike like the FXST or Fat Boy.

4. **Limited Availability of Parts** While Harley still supports belt-drive models, gearbox-specific parts (such as torque converters or certain aftermarket components) may be harder to find.

5. **Learning Curve for Shifting** Riders accustomed to a belt drive may need time to adjust to manual shifting, especially in stop-and-go traffic.

6. **Possible Power Loss in Some Cases** Some riders report a slight loss of low-end torque due to the torque converter s slip characteristics, though this is subjective and depends on tuning.

7. **Not All Modifications Are Compatible** Some aftermarket exhaust or suspension systems may require adjustments to work properly with a gearbox setup.

8. **Warranty Concerns** Harley-Davidson s factory warranty may not cover aftermarket transmissions, leaving the owner responsible for any future issues.

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### **Conclusion**

The **UC710223 transmission conversion** is a **significant upgrade** for Harley-Davidson Softail owners who prioritize **reliability, traditional drivetrain feel, and improved low-end performance**. It is particularly beneficial for riders who frequently drive in **urban environments, cold climates, or those who modify their bikes extensively**.

However, the **high cost, complex installation, and potential learning curve** make it a **major investment** rather than a routine upgrade. If you **already have a well-maintained belt-drive Softail and are satisfied with its performance**, the conversion may not be necessary.

For **enthusiasts who want a more traditional, durable, and efficient drivetrain**, the UC710223 is a **strong consideration**, especially if they plan to keep the bike long-term. Those who prefer **minimal modifications, lower upfront costs, or don t mind occasional belt maintenance** may choose to stick with the stock setup.

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### **Final Recommendation**

- You frequently drive in **stop-and-go traffic or cold weather**.

- You **prefer a traditional gearbox feel** over a belt drive.

- You **plan to modify your bike extensively** and want a more reliable drivetrain.

- You are **prepared for the high upfront cost** and will have it professionally installed.

- You **already have a well-maintained belt drive** and are happy with its performance.

- You **prioritize cost efficiency** and cannot afford the installation expense.

- You **rarely ride in challenging conditions** where a gearbox would provide a noticeable advantage.

- You **value simplicity** and do not want to deal with a major modification.

For most **Heritage Softail FXST or Fat Boy owners**, the UC710223 is a **worthwhile upgrade** if budget and long-term riding habits align with its benefits. However, it is not a **necessary** modification only a **preference-based enhancement**.

Details:

From 2001 chopper built with a Ultima 127 Motor.

part #: uc710223 price

• $800.00

specifications transmissioncycleoi:

• for models: Softail, Heritage, Fat, Boy
• for makes: Harley
• brand: Ultima
• mpn: Uc710223
• part type: Transmission
• made to fit: Harley Davidson
• manufacturer warranty: No
• size: 6 Speed
• material: Chrome
• country of origin: United States

returns transmissioncycleoi:

• paid by: Buyer
• policy: Returns Accepted
• time: 14 Days

general transmissioncycleoi:

• Motorcycle Scooter Parts Accessories > Transmission Drivetrain > Other Transmission Drivetrain Parts
• condition: Used

payments transmissioncycleoi:

• credit card: Discover
• wallet: Paypal
• other

offer transmissioncycleoi:

• quantity: 1
• options: Ship-to-home
• best offers: True
• sold: 0
• availability: In Stock
• started: June 8, 2026

seller transmissioncycleoi:

• # reviews: 163
• rating: 100.0%
• city: Vista, California

shipping transmissioncycleoi:

• carrier: USPS
• cost: $113.81
• service: USPS Ground Advantage
• transit: 4-12 Days
• type: Calculated
• class: Standard

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