DACCO 58HMDS98 Auto Trans Torque Converter QX56

( Brand: Dacco ), ( Manufacturer Part Number: 58HMDS98 ), ( Type: Auto Trans Torque Converter ), ( Fits 1: 2004-2010 Infiniti Qx56 ), ( Fit Note: Automatic Transmission Torque Converter Converter Codes ), ( Manufacturer Warranty: 12 Month Warranty ), ( Attention: Please Read All Notes To Confirm Fitment ), ( Cs-sku: 400 )

Review DACCO Auto Trans Torque Converter fits 2004–2010

The **DACCO 58HMDS98 Auto Transmission Torque Converter** is a high-performance, direct-fit replacement designed specifically for Toyota s 5-speed automatic transmissions found in select models, including the Lexus GX 460 (2004 2010) and its underlying platform, the Toyota QX56 (2007 2009). Engineered to meet or exceed OEM specifications, this torque converter is crafted from premium materials, ensuring durability, smooth operation, and optimal torque multiplication for enhanced acceleration and drivability. The 58HMDS98 model features a robust stator assembly with a high-efficiency lockup clutch, allowing for improved fuel efficiency and reduced transmission wear by minimizing slippage during highway cruising. Its precision-balanced impeller and turbine blades are machined to exacting tolerances, promoting seamless fluid flow and minimizing internal friction, which translates to a quieter, more responsive transmission. The converter s robust housing is designed to withstand the high pressures and temperatures generated during aggressive driving, making it ideal for both daily commuting and spirited off-road adventures. Whether you're tackling rough terrain, towing heavy loads, or simply seeking a more refined driving experience, this torque converter delivers reliable performance and longevity. Backed by DACCO s reputation for quality and compatibility, this part is a trusted upgrade for those looking to restore or enhance the performance of their Toyota or Lexus vehicle s automatic transmission system.

**Pros and Cons of Buying a DACCO 58HMDS98 Auto Transmission Torque Converter for a 2004 2010 Lexus QX56 (and 2007 2009 Toyota 4Runner, depending on application)**

### **Pros**

1. **Compatibility and Fitment** The DACCO 58HMDS98 is designed specifically for the **U340E automatic transmission** found in the **Lexus QX56 (2004 2010)** and is also compatible with the **Toyota 4Runner (2007 2009, U340E transmission)**. This ensures a proper fit without major modifications.

2. **Performance Improvements** This torque converter is often marketed as an **upgraded version** of the stock unit, offering better **shift response, smoother engagement, and improved acceleration** in certain driving conditions. Some users report a more linear shift feel compared to the stock converter.

3. **Durability and Strength** DACCO converters are generally built with **high-quality materials**, including **stamped steel stamping, reinforced housing, and durable clutch packs**, which can improve longevity, especially in towing or aggressive driving scenarios.

4. **Ease of Installation** Since it is a **direct replacement**, installation is relatively straightforward for those with basic mechanical skills. No major transmission modifications are required, though some fluid changes and adjustments may be needed post-installation.

5. **Warranty and Support** DACCO offers a **limited warranty** (typically 1 2 years), and their customer service is often cited as responsive. This provides some peace of mind if issues arise.

6. **Potential for Better Towing** If you frequently tow or carry heavy loads, an upgraded converter can help **reduce stall speed and improve torque multiplication**, making it easier to pull loads without overheating.

7. **Aftermarket Reputation** DACCO is a well-known brand in the **automotive aftermarket**, with a history of producing reliable transmission components. Many users trust their products for performance upgrades.

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### **Cons**

1. **Cost** The DACCO 58HMDS98 is **more expensive** than an OEM (original equipment manufacturer) torque converter. Prices typically range between **$300 $500**, depending on the seller and any additional accessories (like a torque converter housing gasket or fluid).

2. **Mixed User Experiences** While some owners report **noticeable improvements** in shift quality and acceleration, others **do not see a significant difference** from the stock converter. Expectations should be managed this is not a "game-changer" for all drivers.

3. **Potential for Overheating in Extreme Conditions** Some users with heavy towing or aggressive driving report that the converter **can overheat** if the transmission fluid is not changed to a **high-performance synthetic** (such as **Mobil 1 ATF, Dexron VI, or Toyota Type T-IV**) and if the cooling system is not adequate.

4. **Requires Proper Fluid and Filter Replacement** Unlike the stock converter, the DACCO unit **benefits from high-performance transmission fluid**. Failure to use the correct fluid (or neglecting fluid changes) can **void warranty claims** and reduce performance.

5. **Installation Challenges for DIYers** While not extremely difficult, removing the old converter and installing the new one requires **proper torque specifications, alignment, and sometimes a torque converter housing gasket replacement**. Improper installation can lead to **leaks, rough shifts, or even transmission damage**.

6. **Not a Universal Fix for Transmission Issues** If your transmission has **internal damage (solenoid failure, valve body issues, or worn bands/clutches)**, replacing just the torque converter **will not fix those problems**. A full transmission rebuild may still be needed.

7. **Limited Long-Term Data** While DACCO has been around for decades, **long-term reliability data** on this specific converter in the QX56/4Runner is not as extensive as for more common applications (e.g., F-150, Ram 1500). Some users report **clutch wear or pump issues** over extended use.

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### **Conclusion**

The **DACCO 58HMDS98 torque converter** is a **solid upgrade option** for the **Lexus QX56 (2004 2010) and compatible Toyota 4Runner models**, particularly if you:

- Want **smoother shifts and better acceleration** without major transmission work.

- Engage in **light to moderate towing** and need a little extra torque multiplication.

- Are willing to **use high-quality transmission fluid** and maintain the converter properly.

However, it is **not a magic solution** expectations should be realistic. If your transmission is **already failing internally**, this upgrade alone **will not fix it**. Additionally, the **cost and potential for overheating in extreme conditions** mean it s best suited for **performance-oriented drivers who are willing to invest in proper maintenance**.

### **Recommendation**

- **If you notice rough shifts, delayed engagement, or want a slight performance boost**, the DACCO converter is **worth considering**, especially if you pair it with **high-performance ATF (Toyota Type T-IV or Mobil 1 ATF)** and a **fresh transmission filter**.

- **If you tow heavily or drive aggressively**, ensure your **transmission cooler is functioning properly** and consider **supplemental cooling** if needed.

- **If your transmission is already exhibiting symptoms of internal failure (grinding, slipping, delayed engagement)**, address those issues first before replacing just the torque converter.

- **For best results**, have a **professional mechanic** perform the installation if you lack experience with transmission work.

- **Compare alternatives** other brands like **Haynes, Carter, or Mopar** also offer similar upgrades, so **shop around for the best price and warranty**.

**Final Verdict:** The DACCO 58HMDS98 is a **good mid-range upgrade** for the QX56/4Runner, but it is **not a necessary fix** for all owners. Only proceed if you are **satisfied with the rest of your transmission s condition** and want to enhance shift quality and towing capability.

Details:

12 Month Warranty. Auto Trans Torque Converter 58HMDS98 for QX56 2007 2004 2005 2006 2008 2009 2010: Brand: Dacco condition: Remanufactured, Notes Automatic Transmission Codes:40B, B40, FNJ4, J4, Detailed Applications , 2004 - 2010 Infiniti QX565.6L V8RE5R05A.

part #: 58hmds98 price

• $205.13

specifications torquconv:

• for years: 2004-2010
• brand: Dacco
• mpn: 58hmds98
• type: Auto Trans Torque Converter
• fits 1: 2004-2010 Infiniti Qx56
• fit note: Automatic Transmission Torque Converter Converter Codes
• manufacturer warranty: 12 Month Warranty
• attention: Please Read All Notes To Confirm Fitment
• cs-sku: 400

seller torquconv:

• city: Washington, District Of Columbia
• rating: 97.0%
• # reviews: 57675

payments torquconv:

• other
• credit card: Mastercard
• wallet: Paypal

returns torquconv:

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

general torquconv:

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

shipping torquconv:

• service: Standard
• type: Fixed
• transit: 3-6 Days
• cost: $0.00
• class: Standard

offer torquconv:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: May 1, 2026
• quantity: 1

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