1. Boat Outboard Engines To Buy
  2. sku: 22458385893012861
  3. NOS 43-FA437662

NOS 43-FA437662 Gear Box Mercury/chrysler/force

fits model: Force. make: Mercury, Chrysler.

43-fa437662 Nos Mercury/chrysler/force Part 43-fa 437662 Gear Assembly Oem In Original Box

( Brand: Nos ), ( Manufacturer Part Number: 43-FA437662 ), ( Part Type: Gear Box ), ( Country Of Origin: United States )

Review NOS Mercury/chrysler/force Part 43-fa 437662 Gear Assembly Oem In Original Box fits FORCE

The **Mercury/Chysler Force 43-FA 437662 Automatic Transmission** is a robust and meticulously engineered powerhouse designed to deliver seamless performance and enduring reliability in full-size vehicles from the legendary Mercury and Chrysler lineup. This transmission, identified by its unique **43-FA 437662** designation, represents a refined iteration of the iconic **TorqueFlite** family, a transmission system renowned for its smooth shifting, robust construction, and adaptability across a wide range of applications. Built with precision-crafted components, this transmission features a **three-speed automatic design** with a torque converter, allowing it to efficiently manage power transfer from the engine to the drivetrain while minimizing wear and maximizing efficiency. The **43-FA** variant is particularly notable for its integration into high-performance and heavy-duty vehicles, offering enhanced durability and the ability to handle substantial torque loads without compromising on shifting smoothness.

At the heart of this transmission lies a **hydraulically operated valve body**, a critical component that regulates fluid flow to engage and disengage gears with precision. The valve body is intricately calibrated to ensure optimal pressure and timing, resulting in crisp, predictable shifts that enhance both driving comfort and vehicle responsiveness. The **torque converter**, a hallmark of TorqueFlite transmissions, is engineered to multiply engine torque at low speeds, providing a seamless connection between the engine and transmission while also acting as a fluid coupling to absorb shock and reduce strain on the drivetrain. This converter is paired with a **planetary gearset**, a sophisticated arrangement of gears that allows the transmission to achieve multiple forward and reverse speeds through a combination of gear ratios, ensuring the vehicle maintains optimal power delivery across a broad spectrum of speeds and loads.

The **43-FA 437662** transmission is constructed with a focus on longevity and performance, featuring **cast aluminum housing** that provides structural integrity while keeping weight manageable. The internal components, including the **sun, planet, and ring gears**, are machined to exacting tolerances to minimize friction and wear, contributing to the transmission s reputation for reliability. The **seals and bearings** within this transmission are designed to withstand the rigors of heavy-duty use, ensuring that fluid leaks and mechanical failures are kept to a minimum. Additionally, the transmission incorporates a **shift solenoid system**, which works in tandem with the valve body to adjust hydraulic pressures dynamically, allowing for adaptive shifting behavior that can be fine-tuned for either performance or fuel efficiency depending on the vehicle s application.

For maintenance and longevity, the **43-FA 437662** transmission relies on a **high-quality automatic transmission fluid (ATF)**, typically a **Mercon or Chrysler ATF** formulation, which lubricates the internal components, dissipates heat, and ensures smooth operation. Regular fluid changes and inspections are essential to prevent sludge buildup and premature wear, as the transmission operates under high temperatures and pressures during demanding driving conditions. When serviced properly, this transmission can endure hundreds of thousands of miles, making it a cornerstone of durability in classic and modern Mercury and Chrysler vehicles alike.

In summary, the **Mercury/Chysler Force 43-FA 437662 Automatic Transmission** stands as a testament to automotive engineering excellence, blending robustness with refined shifting capability. Whether installed in a classic muscle car, a rugged full-size truck, or a versatile SUV, this transmission delivers a harmonious balance of power, efficiency, and reliability, ensuring that drivers can trust in its performance both on the open road and in the most challenging driving scenarios. Its legacy as part of the TorqueFlite family further cements its place as a transmission built to last, embodying the spirit of American automotive innovation.

### **Pros and Cons of Buying a NOS 43-FA437662 (Mercury/Chrysler/Force 43) Gearbox**

#### **Pros**

1. **High Performance Potential** The 43-FA437662 is a heavy-duty, high-capacity gearbox designed for high-torque applications, making it suitable for muscle cars, trucks, and performance builds. It can handle significant power outputs when properly matched to an engine and drivetrain.

2. **Durability and Strength** Built with robust materials, this gearbox is designed for longevity, especially in demanding conditions. It features reinforced housing, strong bearings, and durable synchronizers, which can withstand aggressive driving and heavy loads.

3. **Compatibility with Classic Engines** This gearbox is commonly used in Mopar (Mercury, Chrysler, Dodge) applications, particularly with big-block engines (e.g., 426 Hemi, 440 Six-Pack, 426 Magnum). It pairs well with high-torque engines that require a strong transmission.

4. **Aftermarket Support** Due to its popularity in classic car restoration and performance builds, parts, rebuild kits, and custom modifications are widely available. This makes maintenance and upgrades easier compared to rare or discontinued units.

5. **Potential for Manual or Automatic Conversion** Depending on the model variant, some versions of this gearbox can be converted from automatic to manual (or vice versa) with the right modifications, offering flexibility for different driving preferences.

6. **Vintage Appeal** For enthusiasts restoring classic vehicles, a NOS (New Old Stock) unit adds authenticity and value, especially if the gearbox is in excellent condition and comes with original documentation.

7. **Lower Cost Than New OEM Units** Compared to brand-new OEM gearboxes, NOS units are often significantly cheaper, making them an attractive option for budget-conscious buyers who still want a high-quality, used part.

---

#### **Cons**

1. **Age and Wear** As a NOS unit, it has likely been stored for decades, which can lead to issues like dried-out seals, rust, or degraded internal components. Even if it s "new old stock," it may require thorough inspection and refurbishment before use.

2. **Potential for Hidden Damage** Without a full inspection (or if purchased sight-unseen), there s a risk of internal wear, bent shafts, or worn synchronizers. Some sellers may not disclose minor flaws, leading to unexpected repair costs.

3. **Limited Warranty or No Warranty** NOS units typically come with no warranty or a very limited one (if any). If the gearbox fails shortly after purchase, the buyer is often on their own for repairs.

4. **Matching Engine and Drivetrain Requirements** This gearbox is not universal it must be properly matched to the engine s torque output and the vehicle s drivetrain (e.g., rear-wheel drive, front-wheel drive conversions may require additional work). Mismatching can lead to premature failure or poor performance.

5. **Rebuild Costs** Even if the gearbox is in decent condition, a professional rebuild can be expensive (often $1,000 $2,500 depending on labor and parts). Buyers must account for this cost upfront.

6. **Rarity and Availability** While not extremely rare, finding a truly NOS unit in perfect condition can be challenging. Some sellers may misrepresent a rebuilt or heavily modified unit as "new old stock," leading to disappointment.

7. **Compatibility with Modern Vehicles** If used in a modern vehicle, additional modifications (e.g., wiring, mounts, or drivetrain adjustments) may be required, adding complexity and cost.

8. **Risk of Counterfeit or Rebuilt Units** The NOS market is not always regulated, and some sellers may pass off rebuilt or remanufactured units as NOS. Buyers should verify the unit s authenticity through documentation, serial numbers, or trusted sources.

---

### **Conclusion**

The **NOS 43-FA437662 gearbox** is an excellent choice for enthusiasts restoring classic Mopar vehicles or building high-performance applications where durability and torque handling are critical. Its strength, compatibility with big-block engines, and aftermarket support make it a valuable component for the right project. However, the risks of hidden damage, lack of warranty, and potential rebuild costs mean it is not a "plug-and-play" solution. Buyers must be prepared for thorough inspection, possible refurbishment, and additional modifications to ensure proper function.

For those willing to invest time and money in inspection, testing, and maintenance, this gearbox can be a **great long-term investment**. For casual buyers or those on a tight budget, a **remanufactured or professionally rebuilt unit** may offer a more reliable and cost-effective alternative.

---

### **Recommendation**

1. **Verify Authenticity** Ensure the unit is truly NOS by checking serial numbers, original packaging, and documentation. Purchase from reputable sellers with a history of honest transactions.

2. **Inspect Thoroughly** Have a transmission specialist or gearbox expert inspect the unit for wear, leaks, or damage before purchasing. A pre-purchase inspection can save thousands in unexpected repairs.

3. **Budget for Rebuild** Even if the gearbox appears good, allocate funds for a professional rebuild if necessary. This is often the safest approach.

4. **Match to Your Application** Confirm that the gearbox is compatible with your engine s torque and the vehicle s drivetrain. Consult with a transmission specialist to ensure proper matching.

5. **Consider Alternatives** If the risk of NOS units is too high, explore **remanufactured units** from trusted manufacturers (e.g., Mopar, Jegs, or specialty rebuilders). These often come with warranties and are thoroughly tested.

6. **Test Drive or Bench Test** If possible, request a test run or bench test of the gearbox to ensure smooth shifting and no internal issues.

7. **Document Everything** Keep records of the purchase, inspection reports, and any modifications made to the gearbox for future reference.

**Final Verdict:**

The **43-FA437662 NOS gearbox is a strong choice for serious restorers and performance builders**, but it requires due diligence. For most buyers, a **rebuilt unit with warranty** may be the smarter financial decision. Always prioritize quality over convenience when investing in a critical drivetrain component.

Details:

May not be in original packaging. Package may have been opened for pictures. New item but may have scuffs/marks/discoloration from time. Mercury/Chrysler/Force Part 43-FA 437662 Gear Assembly OEM Nos In Original Box, N we Old Stock item.

part #: 43fa437662 prices

  • $84.99-$99.99

specifications ouboaen:

  • for models: Force
  • for makes: Mercury, Chrysler
  • brand: Nos
  • mpn: 43-fa437662
  • part type: Gear Box
  • country of origin: United States

shipping ouboaen:

  • cost: $9.06
  • carrier: UPS, USPS
  • type: Calculated
  • transit: 4-7 Days
  • service: UPS Ground, USPS Ground Advantage
  • class: Standard

payments ouboaen:

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

general ouboaen:

  • Boat Parts > Outboard Engines Components > Other
  • condition: New other see details

offer ouboaen:

  • sold: 0
  • availability: In Stock
  • quantity: 2
  • options: Ship-to-home
  • started: March 6, 2026

seller ouboaen:

  • rating: 100.0%
  • city: Vergennes, Vermont
  • # reviews: 705

returns ouboaen:

  • time: 30 Days
  • paid by: Seller
  • policy: Returns Accepted
for models: force, for makes: mercury, chrysler, part type: gear box, country of origin: united states,
category: boat parts > outboard engines components, sku: 22458385893012861,
Nos 43-FA437662 Is Similar To:
ouboaen logo
2 offers $84.99–$99.99 USD
  • New. Offer #1 priced at $99.99 + $8.00 shipping estimate = $107.99* total. +$8.00 shipping
  • New other (see details). Offer #2 priced at $84.99 + $9.42 shipping estimate = $94.41* total. N ewO ldS tock item.+$9.42 shipping

Copyright © ouboaen.com