DACCO 35JZFQS18 Auto Trans Torque Converter

( Brand: Dacco ), ( Manufacturer Part Number: 35JZFQS18 ), ( Type: Auto Trans Torque Converter ), ( 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 Hd fits SIERRA CLASSIC 2500 3500 2001–2002

The **DACCO 35JZFQS18 Auto Transmission Torque Converter** is a high-performance, direct-fit replacement designed specifically for the **2001 2002 Ford Sierra 2500 and 3500 Classic models** equipped with the **5R110 4-speed automatic transmission** paired with the **5.4L Triton V8 (351 cubic inch displacement)**. Engineered to meet or exceed OEM specifications, this torque converter delivers superior torque multiplication, smoother shifting, and enhanced overall drivetrain efficiency, making it an ideal upgrade for enthusiasts seeking improved towing capacity, better throttle response, and a more engaging driving experience. Crafted from durable, high-grade materials, including a robust aluminum housing and precision-machined components, the DACCO converter is built to withstand the demands of heavy-duty applications while maintaining reliability under extreme conditions. Its **18-pulse stator design** ensures optimal fluid flow and cooling, reducing heat buildup and extending the lifespan of the transmission fluid, while the **customized stall speed range** (typically around **1,800 2,200 RPM**) provides a balanced blend of launch power and fuel efficiency, catering to both daily driving and towing needs. Whether you re hauling heavy loads, towing trailers, or simply seeking a more responsive transmission, this torque converter eliminates the sluggishness often associated with stock units, offering a noticeable improvement in acceleration and overall performance. Backed by DACCO s reputation for quality and precision engineering, this direct-fit replacement is a seamless bolt-on solution that restores factory performance or enhances it, ensuring a perfect match for your Sierra s powertrain without the need for additional modifications.

### **Pros and Cons of Buying a DACCO 35JZF-QS18 Torque Converter (Auto Transmission) for a 2001-2002 Ford Sierra 2500/3500 (3500 V8)**

1. **Compatibility** The DACCO 35JZF-QS18 is designed specifically for the **Toyota 35JZ engine**, which shares similar torque characteristics with the **Ford 7.3L V8** in the Sierra 2500/3500. While not an exact match, it is a popular aftermarket choice for heavy-duty applications due to its sturdiness and performance.

2. **Higher Torque Handling** The **QS18** variant is built for higher torque loads (up to 500 lb-ft) compared to stock converters, making it a better fit for a **modified or heavily loaded truck** (e.g., towing, heavy payloads, or performance builds).

3. **Durability** DACCO converters are known for their **high-quality construction**, often featuring **stainless steel stamping, reinforced housing, and strong clutch packs**, which can withstand harsh conditions better than OEM units.

4. **Performance Benefits** A properly sized torque converter can improve **shift quality, acceleration, and overall drivetrain durability** by reducing stress on the transmission and engine.

5. **Widely Available & Tested** Since the **35JZ engine** is popular in performance circles (e.g., Toyota Supra, Lexus GS), this converter has been **heavily modified and tested** by enthusiasts, making it a reliable aftermarket option.

6. **Potential for Better Towing** If your Sierra is used for **towing or heavy hauling**, a stiffer converter can prevent **whip and slippage**, improving control under load.

7. **Cost-Effective Upgrade** Compared to a **full transmission rebuild or replacement**, a torque converter swap is a **relatively inexpensive** way to improve performance and longevity.

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1. **Not an Exact Ford Match** The **35JZF-QS18 is not a direct OEM replacement** for the Ford 7.3L transmission. While it may work, **differences in pump size, stator design, and torque capacity** could lead to **poor shifts, stalling, or transmission damage** if not properly tuned.

- **Valve body tuning** (to match the new converter s characteristics).

- **Solenoid adjustments** (to prevent harsh shifts or stall speed issues).

- **Possible pump or stator replacement** (if the stock components are incompatible).

- **Torque converter housing modifications** (to ensure proper fitment).

3. **Potential for Poor Shift Quality** Since the **35JZ transmission is not the same as the Ford 7.3L**, the **shift feel and response** may be different. Some users report **jerky shifts, delayed engagement, or a "soft" shift** until proper tuning is done.

4. **Risk of Damage to Transmission** If the **transmission is not serviced or tuned**, the **new converter s higher torque capacity** could cause:

- **Excessive wear on the turbine shaft or input shaft**.

- **Stress on the transmission s internal components** (e.g., bearings, seals).

- **Overheating** if the converter is too large for the application.

5. **No Warranty on Ford Compatibility** DACCO does not officially support this converter for **Ford transmissions**, meaning **no warranty coverage** if issues arise from improper fitment.

- **Draining transmission fluid**.

- **Removing the transmission pan and filter**.

- **Disconnecting the converter from the flexplate**.

- **Potential need for a new gasket and seal**.

- **Possible valve body removal for tuning**.

- This is **not a simple DIY job** for beginners.

7. **May Not Improve Stock Performance** If your **transmission is already failing** (e.g., leaking, slipping, or damaged), just replacing the converter **won t fix underlying issues**. A **full transmission rebuild** may still be needed.

8. **Potential for Stall Speed Issues** The **35JZ converter may have a different stall speed** than the stock Ford unit, leading to **poor launch characteristics** or **hard shifts** until properly tuned.

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### **Conclusion & Recommendation**

#### **Should You Buy It?**

You are **modifying the truck for higher torque** (e.g., **big blocks, forced induction, or heavy towing**).

You are **prepared to tune the transmission** (valve body, solenoids, stall speed).

You **understand the risks** and are willing to **diagnose and adjust** shift quality.

You **have experience with transmission work** or are working with a **trusted mechanic**.

You want a **direct OEM replacement** with minimal risk, this is **not the best choice**.

Your **transmission is already damaged**, fixing just the converter **won t solve deeper issues**.

You **don t want to deal with tuning or potential shift problems**, consider a **stock replacement or a more Ford-compatible aftermarket converter**.

1. **Stock Ford 7.3L Torque Converter (OEM Replacement)** If your current converter is **just worn out**, a **new or remanufactured OEM unit** (from **Ford, Mopar, or a reputable remanufacturer**) is the **safest and easiest** option.

- **Torque Converter Specialists (TCS) 7.3L Converter** Designed for the Ford transmission.

- **Dynavisc 7.3L Converter** Another Ford-compatible option with better shift characteristics.

- **Mopar or Ford Remanufactured Converters** Often a **good balance of cost and reliability**.

- **Torque Converter Specialists (TCS) 7.3L Heavy-Duty Converter** Better for **high-torque builds**.

- **Dynavisc 7.3L HD Converter** Stiffer clutch pack for **better towing performance**.

4. **Full Transmission Rebuild** If your **transmission is failing**, a **full rebuild** (with a **new converter, filter, fluid, and internal components**) is often **more cost-effective long-term** than just swapping converters.

- **If you re not modifying the truck for extreme torque and just need a replacement**, get a **stock or Ford-compatible aftermarket converter** (e.g., **TCS or Dynavisc 7.3L**).

- **If you re building a high-torque truck (big block, forced induction, heavy towing)**, the **35JZF-QS18 can work**, but **only if you tune the transmission properly**.

- **If you re unsure, consult a transmission specialist** before purchasing **misapplying this converter could damage your transmission**.

A **Ford 7.3L-specific aftermarket converter (TCS or Dynavisc)** with **proper transmission tuning** is the **safest and most reliable** option unless you have a **very specific need** for the 35JZ unit.

Details:

2001 2003 GMC Sierra 2500 HD 6.0L V8 1000/M74. 2004 -2014, 2016 GMC Sierra 2500 HD 6.0L V8 1000. 2007 GMC Sierra 2500 HD Classic 8.1L V8 1000. 2007 GMC Sierra 2500 HD Classic 6.0L V8 1000.

part #: 35jzfqs18 price

• $441.15

specifications torquconv:

• for models: 2500, 3500, Sierra, Classic
• for years: 2001-2002
• brand: Dacco
• mpn: 35jzfqs18
• type: Auto Trans Torque Converter
• fit note: Automatic Transmission Torque Converter Converter Codes
• manufacturer warranty: 12 Month Warranty
• attention: Please Read All Notes To Confirm Fitment
• cs-sku: 400

payments torquconv:

• credit card: Discover
• other
• wallet: Paypal

returns torquconv:

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

general torquconv:

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

seller torquconv:

• city: Tempe, Arizona
• rating: 97.3%
• # reviews: 58005

shipping torquconv:

• class: Standard
• type: Fixed
• transit: 3-7 Days
• cost: $0.00
• service: Standard

offer torquconv:

• quantity: 1
• availability: In Stock
• sold: 0
• options: Ship-to-home
• started: May 13, 2026

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