Automatic Transmission Mount Replacement for the 1959-1966 Buick Estate Wagon
Resolving clunks and vibrations in your classic Buick wagon starts with this critical part.
- A clunking noise when shifting and new vibrations are the most common signs of a failed mount.
- For this classic vehicle, a new aftermarket mount from a brand like Westar is the most practical and available option.
- Ignoring a bad mount can cause damage to other parts like exhaust, hoses, and engine mounts.
- Replacement is a straightforward DIY job for those with proper tools and safety equipment.
Why the Transmission Mount Matters on Your Classic Wagon
The transmission mount is a simple part, usually a block of dense rubber bonded to metal plates, but it's essential for your car's ride quality and the health of your drivetrain. Over 60+ years, the original rubber has likely become brittle, cracked, or soaked with oil and transmission fluid. When it fails, the heavy transmission can move around more than it should, leading to noises, vibration, and even damage to other components.
Symptoms of a Failing Transmission Mount
If you're experiencing new noises or shakes in your Estate Wagon, the transmission mount is a prime suspect. The signs are often very clear.
- Clunking or Banging Noises: This is the most common symptom. You may hear a loud "clunk" or "thud" when you shift from Park into Drive or Reverse. The noise comes from the transmission lifting under torque and hitting the car's frame because the mount is no longer holding it down. You might also hear this when you accelerate suddenly.
- Excessive Vibration: A worn mount can no longer absorb drivetrain vibrations. You'll feel this as a new or worsening shake in the floor, seats, or even the steering wheel, especially when the car is idling in gear or during acceleration.
- Visible Engine Movement: If you have a helper, you can check for this. With the parking brake set firmly and the service brakes applied, have the helper shift from Park to Reverse or Drive. If you watch the engine, you may see it rock back and forth excessively, which is a clear sign of a bad engine or transmission mount.
Don't Ignore a Bad Mount
While you can still drive the car, a failed mount puts extra stress on other parts. This includes the engine mounts, exhaust pipes, cooling hoses, and driveshaft U-joints. Fixing the mount is a cheap and easy way to prevent more expensive repairs down the road.
Choosing the Right Aftermarket Part
For a vehicle from the 1959-1966 era, finding "New Old Stock" (NOS) OEM parts is nearly impossible. Your realistic options are a used original part from a salvage yard or a new aftermarket mount.
- Used OEM: A used part might seem like a good idea, but its rubber is just as old as the one you're replacing. It's likely to fail soon, if it hasn't already hardened and lost its ability to absorb vibration.
- New Aftermarket: Brands like Westar produce new replacement mounts for classic vehicles. These are often the only way to get a brand-new part. The quality of modern rubber can be very good, and the part is designed to meet original specifications. However, be aware that some aftermarket parts for classic cars, sometimes called "retrofit" mounts, may look slightly different from the original part or require minor adjustments for a perfect fit.
A Note on Westar Mounts
Westar is a well-known aftermarket brand that provides affordable replacement parts. While they are designed to function as direct replacements, some owner experiences with aftermarket mounts on classic cars suggest you should be prepared for potential minor differences in fit compared to a factory original part. Despite this, a new aftermarket mount with fresh rubber will almost always perform better than a 60-year-old original.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (e.g., Westar) | $21.07 |
| New Old Stock (NOS) OEM | Extremely rare, often $100+ if found |
| Used OEM | $20 - $50 (Not Recommended) |
| Shop Labor | $100 - $200 |
Known Issues, Recalls, or TSBs
There are no active recalls or specific Technical Service Bulletins (TSBs) from the NHTSA or General Motors for the automatic transmission mount on the 1959-1966 Buick Estate Wagon. Any failure of this part is due to the age and natural wear of the rubber over many decades. Service information from 1959 does mention checking the mountings if a chatter or clunk is heard.
Frequently Asked Questions (FAQ)
Can I replace the transmission mount myself?
Yes, this is a job that a DIY mechanic with the right tools can handle. It involves safely raising the vehicle, supporting the transmission with a jack, unbolting the crossmember, and swapping the mount. It does not typically require removing the engine or transmission.
How long does it take to replace a transmission mount?
A professional shop can usually complete the job in about 1 to 1.5 hours. For a DIYer, it might take 1-2 hours, depending on your experience and the condition of the bolts.
Will a new mount make my Buick feel different?
Yes, absolutely. If your old mount was worn, a new one will make a noticeable difference. The car will feel smoother, clunking noises when shifting will be gone, and you'll feel fewer vibrations inside the cabin.
Should I replace the engine mounts at the same time?
It's a good idea to inspect them. If the transmission mount has failed, the engine mounts have been under extra stress. Since they are made of the same-aged rubber, they are likely also worn. Replacing them all at once can restore the original smooth feel of your car.
Technical Specifications
The mount consists of a rubber block bonded between two metal plates. It bolts to the transmission tailshaft housing and the frame's transmission support crossmember. Compatibility varies by year and specific transmission (Dynaflow, Super Turbine 300/400), so visual comparison to the original part is highly recommended.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.