MOPAR 791740 Fluid Drive Rear Runner Bearing Nos 8-CYLINDER

( Brand: Mopar ), ( Manufacturer Part Number: 791740 ), ( Material: Steel ), ( Vintage Part: Yes ), ( Type: Bearing Bushing ), ( Universal Fitment: No )

Review MOPAR Chrysler 8-cylinder Fluid Drive Rear Runner Bearing Nos fits IMPERIAL 1939-42

The **Mopar 791740 Rear Runner Bearing Assembly** is a meticulously engineered, high-performance component designed exclusively for the 1939 through 1942 Chrysler Imperial models equipped with the legendary **8-cylinder Fluid Drive transmission**. This bearing assembly serves as a critical component of the Rear Runner axle housing, ensuring smooth, reliable, and durable operation of the drivetrain in these classic vehicles. Crafted to exacting specifications, this bearing kit is built to withstand the demands of vintage driving while maintaining the original mechanical integrity of the Imperial s Fluid Drive system. The assembly features a precision-machined **rear axle housing bearing**, which supports the driveshaft and differential assembly, reducing friction and preventing premature wear. Constructed from high-grade steel, the bearing is designed to handle the torque and load of the Imperial s powerful 8-cylinder engine, whether navigating the winding roads of a restoration project or cruising along modern highways. This part is a direct-fit replacement, ensuring compatibility with the original Fluid Drive setup, including the distinctive **Rear Runner** differential housing, which was a hallmark of Chrysler s innovative drivetrain technology of the era. Whether restoring a showroom-fresh Imperial or maintaining a well-loved classic, this bearing assembly guarantees optimal performance, quiet operation, and longevity, allowing enthusiasts to preserve the mechanical heritage of one of America s most iconic automobiles.

### Pros and Cons of buying a Mopar Part Number 791740 (1939-42 Chrysler Imperial 8-Cylinder Fluid Drive Rear Runner Bearing)

1. **Direct Fitment** This part is specifically designed for the 1939-1942 Chrysler Imperial models with an 8-cylinder engine and Fluid Drive transmission. It ensures compatibility without modifications, reducing the risk of installation errors.

2. **High-Quality Construction** Mopar (Chrysler s original equipment parts division) is known for producing durable, well-engineered components. This bearing is likely built to the same standards as the original parts, ensuring longevity and reliability.

3. **Prevents Premature Failure** The rear runner bearing supports the driveshaft and helps maintain smooth operation of the Fluid Drive transmission. A failing bearing can cause excessive vibration, noise, or even transmission damage. Replacing it proactively can extend the life of the drivetrain.

4. **Easier Maintenance** Since this is a standalone bearing, replacing it is often a straightforward job that doesn t require major disassembly of the transmission or drivetrain. This makes it a cost-effective maintenance task compared to larger repairs.

5. **Availability of Supporting Parts** Mopar parts are widely available through automotive suppliers, dealerships, and online retailers. If additional components (like seals, gaskets, or fluid) are needed during installation, they are likely easy to source.

6. **Potential for Improved Performance** If the original bearing was worn or damaged, replacing it with a new Mopar part can restore smooth operation, reduce vibration, and prevent further wear on connected components.

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1. **Cost** While not excessively expensive for a bearing, it may still be a noticeable outlay if you re working on an older vehicle. The price could be higher than aftermarket alternatives, though quality may vary.

2. **Installation Complexity** Depending on the condition of the vehicle and the transmission, removing the old bearing and installing the new one may require some mechanical skill. If the Fluid Drive housing is corroded or the driveshaft is seized, additional labor or tools may be needed.

3. **Potential for Counterfeit Parts** As with many aftermarket or OEM parts, there is a risk of purchasing a fake or low-quality replica, especially if buying from untrusted sources. Always verify the seller s reputation and part authenticity.

4. **Limited Longevity in Harsh Conditions** If the vehicle is driven in extreme conditions (e.g., heavy loads, off-roading, or extreme temperatures), the bearing may wear out faster than expected. Regular fluid changes and maintenance are still critical.

5. **Compatibility Concerns** While this part is designed for the specified models, slight variations in later or earlier model years (even within the 1939-1942 range) could cause fitment issues. Double-checking the part number and application is essential.

6. **Labor Costs if Professional Help is Needed** If you re not comfortable performing the replacement yourself, labor costs at a shop could add to the total expense. However, this is true for any mechanical repair.

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The Mopar 791740 rear runner bearing for the 1939-42 Chrysler Imperial is a reliable and well-suited replacement part for vehicles experiencing drivetrain issues. Its direct fitment, high quality, and preventative benefits make it a strong choice for maintaining or restoring the performance of these classic cars. However, the cost, installation effort, and potential for counterfeit parts are factors to consider.

If you re experiencing symptoms like unusual noise, vibration, or difficulty shifting in the Fluid Drive transmission, replacing this bearing is a practical and cost-effective solution. For best results, ensure you purchase from a reputable source, follow proper installation procedures, and maintain the drivetrain with regular fluid changes.

- **Buy from a trusted supplier** (e.g., Mopar dealership, reputable online retailers like RockAuto, or a classic car parts specialist) to avoid counterfeit parts.

- **Gather the necessary tools** (socket set, jack, transmission jack, possibly a bearing puller) and follow a step-by-step guide or consult a mechanic if unsure about installation.

- **Inspect the surrounding components** (seals, gaskets, driveshaft) during replacement to address any other wear that may have developed.

- **Consider the vehicle s overall condition** if the rest of the drivetrain is worn, address those issues simultaneously for long-term reliability.

For most owners of these classic Chryslers, this part is a worthwhile investment to keep the vehicle running smoothly and avoid more costly repairs down the line.

Details:

Type: Bearing Bushing. Happy motoring. 1939-42 Chrysler 8 Cylinder Fluid Drive Rear Runner Bearing 791740 NOS. Make: Chrysler.

Year: 1939-42. Model: All 8 cylinder model's equipped with Fluid Drive. 1939-42 Chrysler Imperial 8-Cylinder Fluid Drive Rear Runner Bearing 791740 NOS. All we ask is that ship back with original box.

part #: 791740 prices

• $21.24-$45.00

specifications engimou:

• for models: Imperial
• for makes: Chrysler, Mopar
• for years: 1939-42
• brand: Mopar
• mpn: 791740
• material: Steel
• vintage part: Yes
• type: Bearing Bushing
• universal fitment: No

general engimou:

• Car Truck Parts Accessories > Engines Engine Parts > Engine Mounts
• condition: New

offer engimou:

• availability: In Stock
• quantity: 1
• started: March 7, 2026
• options: Ship-to-home
• sold: 0

returns engimou:

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

payments engimou:

• other
• credit card: Diners-club
• wallet: Google-pay

shipping engimou:

• carrier: USPS
• class: Standard
• cost: $8.30
• transit: 5-10 Days
• service: USPS Ground Advantage
• type: Calculated

seller engimou:

• city: West Newton, Massachusetts
• # reviews: 19667
• rating: 99.7%

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