CHEVY 3789949 Nos Lower Rear Motor Mount Set 235261265283 General

( Brand: Chevy ), ( Manufacturer Part Number: 3789949 ), ( Mounting Style: Bolt-on ), ( Items Included: Rear Mount ), ( Material: Steel, Rubber ), ( Vintage Part: Yes ), ( Placement On Vehicle: Lower ), ( Type: Engine Mount Kit ), ( Oe/oem Part Number: 1954 1955 1956 1957 1958 3100 3124 Cameo ), ( Item Height: Factory ), ( Universal Fitment: No ), ( Country Of Origin: United States ), ( Item Width: Oem ), ( UPC: 235261265283 )

Review CHEVY General Motors Nos Gmc Truck Pickup Lower Rear Motor Mount Set 235 265 Usa fits 283 1954–1972

For enthusiasts and restorers seeking the perfect blend of authenticity and performance for their classic Chevrolet and GMC trucks from the mid-20th century, the **OEM-style lower rear motor mount set (part numbers 3789949, 1954-1972 Chevy/GMC, compatible with 235, 265, and 283 cubic inch small-block engines)** represents an essential upgrade or replacement component designed to restore factory precision and reliability. These mounts are meticulously crafted to replicate the original design specifications of the iconic 1954 through 1972 Chevrolet and GMC full-size trucks, ensuring seamless integration with the truck s frame and suspension system. Engineered from high-quality, durable materials typically heavy-duty steel or reinforced rubber these mounts are built to withstand the rigors of daily driving, towing, or heavy-duty applications while maintaining the original vehicle s alignment and driveline balance. Whether you re working on a vintage project truck, a daily driver, or a high-performance build, these mounts provide the necessary support to keep the engine and transmission securely in place, reducing unwanted movement and vibration that can lead to premature wear on related components like the driveshaft, rear axle, or even the engine mounts themselves. The universal fitment for the 235, 265, and 283 small-block engines ensures broad compatibility, making this set a versatile choice for a wide range of restoration and modification projects. By installing these OEM-replica mounts, owners can enhance the structural integrity of their vehicle, improve ride quality, and ensure that their classic truck operates with the same level of confidence and performance as it did when it rolled off the assembly line. Perfect for both the meticulous restorer and the performance-minded mechanic, this set is a straightforward yet impactful upgrade that bridges the gap between nostalgia and modern reliability.

### **Pros and Cons of Buying a Chevy/GMC Lower Rear Motor Mount Set (Part Numbers: 3789949, 1954-1972, Fits 235, 265, 283 Engines)**

1. **Direct Fitment** This part is specifically designed for 1954 1972 Chevy/GMC trucks with 235, 265, or 283 engines, ensuring compatibility without modification.

2. **Improved Engine Support** Worn or damaged rear motor mounts can cause excessive engine movement, leading to rough idle, driveline vibration, or even transmission damage. Replacing them restores proper alignment and reduces stress on the drivetrain.

3. **Prevents Further Damage** Ignoring failing mounts can lead to more costly repairs, such as transmission or rear axle issues. Replacing them proactively can save money long-term.

4. **Better Ride Comfort** A properly supported engine reduces vibration and harshness, improving overall driving smoothness.

5. **Easy Installation** These mounts are designed for straightforward replacement, typically requiring only basic tools and minimal disassembly.

6. **Durability** High-quality aftermarket or OEM-style mounts are built to last, especially if made from reinforced rubber or polyurethane.

7. **Compatibility with Common Mods** Many performance builds (e.g., big-block swaps, heavy-duty transmissions) benefit from upgraded mounts to handle increased weight and torque.

1. **Cost** While not extremely expensive, aftermarket mounts may cost more than OEM replacements if available. Prices can vary based on brand and material (e.g., polyurethane vs. rubber).

2. **Installation Difficulty (If DIY)** If the mounts are located in a tight space (e.g., under a heavy engine or transmission), removal and installation may require patience and possibly additional tools (e.g., a transmission jack or engine hoist).

3. **Potential for Counterfeit Parts** Cheap or knockoff mounts may fail prematurely or not fit correctly. Buying from reputable brands (e.g., Moroso, Holley, or genuine OEM) mitigates this risk.

4. **Additional Wear Check** While replacing the mounts, it s wise to inspect other drivetrain components (e.g., bushings, shocks, or frame rails) for wear, which could add to labor costs if they need replacement.

5. **Limited Longevity in Harsh Conditions** Extreme heat, cold, or off-road use can degrade rubber mounts faster than expected. Polyurethane mounts may last longer but can be noisier.

6. **Possible Misalignment Issues** If not installed correctly, new mounts could cause driveline angles to shift, leading to vibration or transmission slippage (especially in manual transmissions).

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### **Conclusion**

Replacing the lower rear motor mounts on a 1954 1972 Chevy/GMC with a 235, 265, or 283 engine is a **highly recommended maintenance task** for most owners. The benefits such as improved drivability, prevention of further damage, and better engine support far outweigh the minor drawbacks (cost, installation effort, or potential for counterfeit parts). The key is sourcing **high-quality parts** and ensuring proper installation.

If you re comfortable with basic mechanical work, this is a manageable DIY job. If not, a professional mechanic can complete it quickly. **Prioritize this repair** if you notice engine movement, transmission vibration, or a clunking noise during shifts ignoring it could lead to more expensive repairs down the road.

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- **Buy:** A **reputable aftermarket brand** (e.g., Moroso, Holley, or a trusted OEM equivalent) for reliability and fit.

- **Install:** Follow the manufacturer s instructions carefully, and consider using a transmission jack or engine hoist if the engine is heavy.

- **Inspect:** Check for other worn components (e.g., rear main seal, driveshaft yokes) while the area is accessible.

- **Maintain:** Replace mounts every **50,000 70,000 miles** or if they show signs of cracking/wear, especially in high-mileage or performance applications.

This upgrade is a **cost-effective way to extend the life of your drivetrain** and keep your classic truck running smoothly.

Details:

This is a set of Rear Lower motor mounts, some light surface rust, see pics, these fit 1954 and up Chevy GMC 1/2 ton 3/4 With factory motors 235,261, 265, 283, 327. 228, 248, 270, 302. Group # 0.027, part 3789949.

part #: 3789949 prices

• $12.50-$69.95

specifications engimou:

• for makes: Chevy, Gmc
• for years: 1954-1972
• brand: Chevy
• mpn: 3789949
• mounting style: Bolt-on
• items included: Rear Mount
• material: Steel, Rubber
• vintage part: Yes
• placement on vehicle: Lower
• type: Engine Mount Kit
• oe/oem part number: 1954 1955 1956 1957 1958 3100 3124 Cameo
• item height: Factory
• universal fitment: No
• country of origin: United States
• item width: Oem
• upc: 235261265283

payments engimou:

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

shipping engimou:

• type: Fixed
• class: Standard
• cost: $12.10
• carrier: UPS
• service: UPS Ground
• transit: 3-6 Days

offer engimou:

• sold: 0
• options: Ship-to-home
• quantity: 1
• started: February 20, 2026
• availability: In Stock
• best offers: True

returns engimou:

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

general engimou:

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

seller engimou:

• rating: 100.0%
• # reviews: 1985 3
• city: El Dorado, Kansas

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