PRECISION 4643JMDZ-3 Torque Converter 6L80 6L90

( Brand: Precision ), ( Manufacturer Part Number: 4643JMDZ-3 ), ( Part Type: Torque Converter )

Review PRECISION Torque Converter #4643 Damaged

The **Precision 4643JMDZ-3 Torque Converter** is a high-performance, direct-fit replacement designed specifically for Ford s legendary 6.8L and 7.3L Triton V10 engines, including applications in the **F-150, Excursion, Expedition, and E-Series Super Duty trucks** equipped with the **6L80E and 6L90E automatic transmissions**. Engineered to meet or exceed OEM specifications, this torque converter is built with premium materials and advanced manufacturing techniques to ensure durability, smooth operation, and optimal power transfer. The **3.50 stall speed** is carefully calibrated to provide a balance between launch performance and drivability, making it ideal for both daily driving and demanding towing or hauling tasks. Constructed with a **high-strength aluminum housing**, this torque converter features a **precision-machined turbine and pump hub**, along with a **multi-disc clutch assembly** that delivers exceptional engagement response and heat resistance. The **stator and one-way clutch** are designed to minimize slippage and maximize efficiency, reducing fuel consumption while maintaining robust torque multiplication. Whether installed in a **2004-2010 Ford F-150 with the 6.8L Triton** or a **2007-2014 Expedition with the 7.3L Triton**, this torque converter is a direct bolt-on solution that restores factory performance without compromising reliability. Built to withstand the rigors of heavy-duty applications, it is an excellent choice for enthusiasts seeking a cost-effective upgrade or a replacement for a worn-out OEM unit.

### **Pros and Cons of buying a ACDelco Precision 4643JMDZ-3 Torque Converter (Compatible with 6L80E/6L90)**

1. **OEM Quality and Compatibility** This torque converter is manufactured by ACDelco, a trusted brand known for producing high-quality aftermarket parts that meet or exceed OEM specifications. It is designed specifically for GM 6-speed automatic transmissions (6L80E and 6L90), ensuring proper fitment and performance.

2. **Improved Performance and Efficiency** A well-matched torque converter can enhance shifting smoothness, reduce transmission wear, and improve fuel efficiency. The 4643JMDZ-3 is optimized for modern transmissions, offering better torque multiplication and response compared to stock or poorly matched converters.

3. **Durability and Longevity** ACDelco parts are built to last, often outperforming cheaper alternatives in terms of durability. The precision machining and high-quality materials reduce the risk of premature failure, which is especially important in high-torque applications.

4. **Warranty Coverage** ACDelco typically offers a warranty (usually 12 24 months), providing peace of mind against defects. This is a significant advantage over generic or no-name converters, which may lack proper backing.

5. **Better Shift Quality** If your transmission is experiencing harsh shifts, a properly sized torque converter can improve engagement points, reducing jerkiness and improving overall drivability.

6. **Compatibility with Upgrades** If you re modifying your vehicle (e.g., adding a supercharger, turbo, or performance exhaust), this converter can handle increased torque better than a stock unit, preventing transmission damage.

7. **Easier Installation** Since it s a direct replacement, installation is straightforward for those with basic mechanical skills. No major modifications to the transmission are usually required.

---

1. **Higher Upfront Cost** Compared to generic or budget torque converters, the ACDelco Precision model is more expensive. Prices typically range between **$300 $500**, depending on the retailer and any additional fees (shipping, labor if installed professionally).

2. **Potential Overkill for Stock Applications** If your vehicle is not heavily modified and runs stock power, a high-performance converter like this may be more aggressive than necessary. Some drivers report that it can make the transmission feel "too stiff" or require slight adjustments in programming (e.g., via a tuner).

3. **Requires Proper Installation and Break-In** Like any torque converter, improper installation (e.g., incorrect fluid type, improper torque specs, or not following break-in procedures) can lead to premature failure. This may require professional installation, adding to costs.

4. **May Not Be Necessary for Mild Modifications** If your vehicle has only minor upgrades (e.g., a mild exhaust or slight power increase), the benefits of this converter may not justify the cost. A stock or slightly upgraded converter might suffice.

5. **Limited Availability of Aftermarket Support** While ACDelco is reliable, some specialized aftermarket converters (e.g., those from brands like Torque Converter Specialties or Torque Converter Direct) offer more customization options for extreme builds. However, these are often more expensive and may require additional transmission modifications.

6. **Possible Shift Adjustments Needed** Some users report that switching to this converter may require recalibration of the transmission control module (TCM) or a tune to optimize shifts, especially if the vehicle has an older ECU.

7. **Not a Fix for Transmission Issues** If your transmission is already failing (e.g., slipping, leaking, or internal damage), replacing just the torque converter will not resolve deeper problems. A full transmission rebuild or replacement may be needed.

---

The **ACDelco Precision 4643JMDZ-3 torque converter** is a strong choice for drivers looking to upgrade their **6L80E or 6L90 transmission**, particularly those with modified vehicles or those experiencing shifting issues. Its OEM-quality construction, improved performance, and warranty make it a reliable option. However, it is not a universal fix it is best suited for vehicles with **moderate to high power levels** or those needing smoother shifts.

For **stock or lightly modified vehicles**, the benefits may not outweigh the cost, and a stock or slightly upgraded converter might be sufficient. If you re unsure, consulting a transmission specialist or performance tuner can help determine if this converter is the right fit for your application.

---

- You have a **modified vehicle** (e.g., forced induction, heavy-duty exhaust, or significant power increase).

- Your transmission is experiencing **harsh shifts, slippage, or poor engagement**.

- You want a **high-quality, long-lasting replacement** with warranty support.

- You re open to **potential shift adjustments** (tuning or TCM reprogramming) for optimal performance.

- Your vehicle is **stock or only mildly modified**, and you don t need the extra performance.

- You re on a **tight budget**, as cheaper alternatives (while riskier) may suffice.

- Your transmission has **underlying issues** (e.g., fluid leaks, internal wear) that need addressing before converter replacement.

For the best results, pair this converter with **high-quality transmission fluid (e.g., Mopar ATF 4 or Dexron VI)** and follow proper installation and break-in procedures. If possible, have a professional install it to ensure optimal performance.

Details:

Sold strictly as-is for parts or repair. Functional status is unknown and has not been tested. Visible wear marks and grooves are present on both the interior exterior of shaft, consistent with bearing contact. No guarantees on performance or usability.

There is residual oil inside, likely from previous testing or operation. Unit shows significant wear from prior use.

part #: 4643jmdz3 prices

• $109.99-$790.05

specifications torquconv:

• brand: Precision
• mpn: 4643jmdz-3
• part type: Torque Converter

returns torquconv:

• policy: No Returns

general torquconv:

• Car Truck Parts Accessories > Transmission Drivetrain > Torque Converters
• condition: For parts or not working

payments torquconv:

• credit card: Mastercard
• wallet: Apple-pay
• other

shipping torquconv:

• class: Standard
• service: UPS Ground
• transit: 3-9 Days
• type: Calculated
• carrier: UPS
• cost: $88.89

offer torquconv:

• quantity: 1
• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: April 29, 2026

seller torquconv:

• city: Springville, Utah
• rating: 99.7%
• # reviews: 1392

Precision 4643JMDZ-3 Is Similar To:

• 219410 Precision Industries Sbc Torque (35.6% similar) 5 vigilante 2500 stall torque converter for a ABC TH400 350 pg. By Precision industries part. This is a new about half price for converter...(November 9th, 2017)
• 2443ls Precision Torque Converter Fits (53.5% similar) Remanufactured by Precision, part number 2443LS. Rubber parts, gaskets, hardware may need to be replaced and not usable. Be sure the part you are buying is correct for your application. Shipping:free shipping is for continental USA only. Or any other minor issue that does not make the part you are ...(February 15th, 2018)
• 2501 Precision Of New Hampton Torque Converter (51.4% similar) Precision of new Hampton torque converter, part paid 400 for it from pa. After installation my engine lost compression and I ended up dropping in a crate motor which required different torque converter set. I bought this for my 1966 mustang with a 289 and c4 transmission. Price does not include ...(September 23rd, 2018)
• 2640hs Precision Automatic Transmission Torque Converter Fits Ford Aod (46.6% similar) None of which makes the part defective. Or any other minor issue that does not make the part you are buying defective. Be sure the part you are buying is correct for your application. Once purchased you own it. Please through for any questions. No matter what says. If any manufacturer warranty ...(March 23rd, 2018)
• 483318-3 Precision Industries Ford Super Duty Stallion Torque Converter (41.8% similar) You can see more details about the converter on Precision industries site. American and import auto interiors item for sleep your consideration, torque converter vehicle model removed from our 2008 ford F250 XLT lariat CREWCAB6. The oil was clean and did not have a foul odor. These are a very well...(April 6th, 2019)
• 4842 Precision Torque Converter Stock Stall Gm Rwd (54.9% similar) 700R4 4L60E torque converter lock UP1. 750 input splines stall color may differ from photo fast shipping. 703 pilot diameter 12 or 298MM bolt circle 10...(January 24th, 2019)
• 5451lshd Precision New Hampton Torque (36% similar) Every effort has been made to accurately describe all merchandise offered. Ups shipping is not offered. We often provide fitment data on our listings. Economy shipping is typically mailed by cheapest method. Sometimes there are errors in this data, please understand that accidents happen but we'll ...(July 1st, 2017)
• 63450 Precision Industries Perormance Torque Converter Gm Chevrolet (47.7% similar) It is in great used condition. This is a Precision industries single disk 10. 5 stall converter removed from a Cadillac CTS with 6L80E transmission. It stalls 2400 at 400HP. Will stall higher with more power...(March 24th, 2019)
• 6662 Precision Torque Converter (55.3% similar) I was going to use it when replaced my transmission, but turns out am not replacing transmission. I bought this Precision torque converter from auto zone, it here a 9 mos ago. Fits my aura DX too much of a pain...(October 10th, 2017)
• B29dcnf Precision Precison Torque Converter (50.9% similar) Free shipping. 65373 16DB pallet. Please consider the pictures of offer carefully. Thanks again for considering our offer. You are buying on a Precision B29DCNF torque converter 4842-B-H...(June 12th, 2017)
• 5430 Precision International Rebuilt Torque Converter Never Installed R-17 (46.7% similar) ...(November 3rd, 2016)