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  3. CUSTOM SS8F89B-C4

CUSTOM SS8F89B-C4 Fti Lockup Torque Converter 164

fits model: Ss8f, C4. make: Ford.

Ss8f89b-c4 Custom Fti Ss8f Non-lockup 8 Inch Torque Converter For Ford C4 164 Tooth

( Brand: Custom ), ( Manufacturer Part Number: SS8F89B-C4 ), ( Part Type: Torque Converter ), ( Performance Part: Yes )

Review CUSTOM Fti Non lockup Inch Torque Converter Ford 164 Tooth fits SS8F C4

The **SS8F89B-C4 F/TI SS8F Non-Lockup Torque Converter** is a high-performance, factory-style replacement designed specifically for Ford s legendary **C4 automatic transmission**, commonly found in muscle cars like the **Mustang (1971 1993), Thunderbird, and SVO models**, as well as the **Ford E-Series vans and commercial trucks**. Engineered to deliver superior power transfer and smooth operation, this torque converter is a direct bolt-on alternative to the stock unit, ensuring compatibility without the need for transmission modifications. Built with a **stamped aluminum housing** and a **high-quality, durable stator**, it features a **non-lockup design**, meaning it remains open under all conditions, eliminating the risk of clutch drag or premature wear while maintaining exceptional torque multiplication ideal for high-performance applications where reliability and responsiveness are critical.

The **SS8F89B-C4** incorporates a **full-face, high-efficiency turbine**, which enhances fluid flow and reduces stall speed, allowing the transmission to engage more quickly under heavy loads while minimizing heat buildup. Its **spun aluminum case** is precision-machined for optimal balance, reducing vibration and improving overall durability, even under aggressive driving conditions. The **stator assembly** is designed with a **one-way clutch** to maximize fluid pump efficiency, ensuring consistent pressure and smooth shifting especially beneficial in high-torque applications where stock converters may struggle. This torque converter is particularly well-suited for **turbocharged or supercharged engines**, as well as **high-mileage or modified transmissions**, where stock units may fail due to wear or inadequate performance.

For those seeking a **drop-in replacement** without sacrificing performance, the **SS8F89B-C4** is an excellent choice, offering the same footprint as the original Ford unit while delivering improved torque multiplication and better heat dissipation. Whether installed in a **restomod project, a daily driver with a modified engine, or a classic Ford with a rebuilt transmission**, this converter ensures a seamless power delivery experience. Built to withstand the demands of modern performance driving, it is backed by **rigorous testing** to guarantee longevity and compatibility, making it a trusted upgrade for enthusiasts who demand both reliability and power.

### **Pros and Cons of Buying an SS8F89B-C4 (FTI) SS8F Non-Lockup Torque Converter for a Ford C4 (164) Transmission**

#### **Pros:**

1. **Improved Performance** The SS8F series torque converters are designed for high-performance applications, offering better stall speed and torque multiplication compared to stock units. This can enhance acceleration and towing capacity, especially in modified or high-horsepower engines.

2. **Better Stall Speed** The SS8F89B-C4 has a higher stall speed than the stock torque converter, which helps maintain engine RPM under load, improving throttle response and drivability.

3. **Durability** These converters are built with high-quality materials and precision machining, making them more resistant to wear and tear compared to aftermarket knockoffs or stock units.

4. **Compatibility with Modifications** If your Ford C4 (164) is running a turbocharged, supercharged, or high-performance engine, this torque converter is better suited to handle the increased power output without slipping.

5. **FTI (Full Torque Interceptor) Technology** The FTI version includes a clutch assembly that helps reduce stall speed while maintaining strong torque multiplication, improving fuel efficiency and drivability in daily driving conditions.

6. **Non-Lockup Design** Since this is a non-lockup converter, it provides smoother engagement without the risk of binding or overheating that can occur with lockup converters under heavy loads.

7. **Warranty & Reputation** SS8F converters are known for their reliability and are backed by reputable manufacturers, reducing the risk of premature failure.

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#### **Cons:**

1. **Cost** High-performance torque converters are significantly more expensive than stock or basic aftermarket units. The SS8F89B-C4 will likely cost several hundred dollars, which may not be justified for stock or lightly modified vehicles.

2. **Potential Overkill for Stock Engines** If your Ford C4 is running a naturally aspirated or mildly modified engine (under 400-500 hp), the benefits of this torque converter may be minimal, and the extra cost may not be worth it.

3. **Transmission Wear Concerns** A torque converter with a higher stall speed can increase stress on the transmission s internal components (e.g., planetary gears, bearings) if the transmission is not properly supported or if fluid is not changed regularly.

4. **Requires Proper Installation** Improper installation (e.g., incorrect fluid, misalignment, or torque specs) can lead to premature failure. This converter may require additional modifications, such as a stronger transmission housing or upgraded transmission cooler.

5. **Potential for Overheating** If the transmission is not adequately cooled or if the converter is not properly sized for the engine s power output, it could overheat under heavy loads, reducing longevity.

6. **Limited Availability of Parts** If something goes wrong with the converter, finding replacement parts or a technician familiar with SS8F units may be more difficult than with stock or more common aftermarket converters.

7. **Possible Transmission Tuning Needed** Some drivers report that installing a high-performance torque converter may require adjustments to the transmission s shift solenoids or ECU settings to optimize performance.

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### **Conclusion:**

The **SS8F89B-C4 (FTI) non-lockup torque converter** is an excellent choice for **high-performance Ford C4 (164) transmissions** running **500 horsepower**, turbocharged, or supercharged engines. It provides **better stall speed, durability, and drivability** while maintaining smooth operation. However, for **stock or lightly modified engines**, the cost may not be justified, and the benefits may be negligible.

If you are running a **high-power setup**, this converter will significantly improve performance and reliability. If you are unsure, consider running a **stock or slightly upgraded converter** (such as an SS8F with a moderate stall speed) to see if your transmission can handle the extra power before investing in a high-end unit.

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### **Recommendation:** - **Buy the SS8F89B-C4 if:**

- Your Ford C4 is running **500 horsepower** (naturally aspirated, turbocharged, or supercharged).

- You want **maximum torque multiplication and stall speed** for aggressive driving or towing.

- You are willing to invest in **proper transmission cooling, high-quality fluid, and potential tuning** to support the converter.

- **Avoid or reconsider if:**

- Your engine is **stock or mildly modified (under 400-500 hp)** a standard or slightly upgraded converter may suffice.

- You are on a **tight budget** and cannot justify the extra cost.

- Your transmission has **history of overheating or internal wear** a high-performance converter may exacerbate these issues.

For the best results, **consult with a transmission specialist** before purchasing to ensure compatibility with your specific setup. Additionally, **use high-quality transmission fluid (e.g., Mopar ATF 4 or a synthetic alternative)** and **monitor transmission health** after installation.

Details:

FTI 8 torque converter used behind a 400 horsepower small block Ford in fox body Mustang with C4 transmission. This is a $1500 torque converter only used for handful of races last year before switching to turbo combo this winter requiring 9.5. The lifetime warranty was also purchased with this converter. Car would leave at 4800 PMS and 60' in the low 1.40's, high 1.30s depending on track condition.

specifications torquconv:

  • for models: Ss8f, C4
  • for makes: Ford
  • brand: Custom
  • mpn: Ss8f89b-c4
  • part type: Torque Converter
  • performance part: Yes

shipping torquconv:

  • service: USPS Ground Advantage
  • type: Calculated
  • cost: $59.28
  • class: Standard
  • transit: 4-8 Days
  • carrier: USPS

general torquconv:

  • condition: Used
  • Car Truck Parts Accessories > Transmission Drivetrain > Torque Converters

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seller torquconv:

  • city: Leavenworth, Kansas
  • rating: 100.0%
  • # reviews: 668

offer torquconv:

  • options: Ship-to-home
  • availability: In Stock
  • started: May 11, 2026
  • quantity: 1
  • best offers: True
  • sold: 0
for models: ss8f, c4, for makes: ford, part type: torque converter, performance part: yes,
category: auto parts > car truck parts accessories > transmission drivetrain > torque converters, sku: 7521013501600008,
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