Automatic Transmission Mount Guide for 1975-1985 Buick LeSabre
Eliminate clunking noises and excess vibration by replacing your worn transmission mount.
- A bad transmission mount on your LeSabre will cause clunking noises and vibrations.
- Replacement is an easy DIY job for this rear-wheel-drive car, typically taking about an hour.
- Standard rubber mounts (Anchor, Westar) are cheap and restore factory comfort, while polyurethane mounts (Prothane) offer durability at the cost of more vibration.
- There are no specific recalls or TSBs for this part on your vehicle.
Signs of a Failing Transmission Mount
When the transmission mount on your LeSabre wears out, the rubber cracks or collapses, leading to several noticeable problems. Because this is a simple part, the symptoms are usually straightforward.
🎬 Watch: 5 common symptoms of a failing transmission mountCommon Failure Symptoms
- Clunking or Banging Noises: The most common symptom is a loud clunk or bang when you shift gears, especially from Park to Reverse or Drive. You might also hear this noise during hard acceleration or braking as the transmission shifts and hits the frame.
- Excessive Vibrations: A worn mount can no longer absorb drivetrain vibrations, so you'll feel them in the cabin, through the floor, and in the steering wheel. This shaking may be constant or appear only when accelerating.
- Drivetrain Movement: In severe cases, you might feel the engine and transmission assembly move or lurch. A mechanic might notice the engine and transmission visibly rocking more than they should when revving the engine with the brakes applied.
Choosing the Right Aftermarket Mount
For a 1975-1985 Buick LeSabre, you won't find new OEM (Original Equipment Manufacturer) mounts from a dealer. All available options are from aftermarket companies. Fortunately, you have several choices that fit different needs and budgets.
Standard Replacement Mounts (Good)
These are designed to be direct, factory-style replacements made of rubber and steel. They prioritize a smooth, quiet ride by absorbing vibrations effectively. Brands like Anchor, Westar, and DEA fall into this category. They are very affordable and are a good choice for daily drivers where comfort is the main goal. Forum discussions show mixed opinions on these brands, with some users having good experiences while others report premature failures. However, for a stock LeSabre, they are generally considered an acceptable and budget-friendly fix.
Performance Mounts (Better)
If you want a more durable, long-lasting solution, consider a performance mount. These are often made from polyurethane, a much stronger material than rubber.
- Prothane: This brand specializes in polyurethane mounts. A Prothane mount will be much stiffer, which reduces drivetrain movement and provides a more connected feel. This is a great upgrade for performance or heavy-duty use.
- Lakewood: Also known for performance parts, Lakewood offers heavy-duty mounts that can handle more power and abuse than stock-style rubber mounts.
Pro Tip: While polyurethane mounts from brands like Prothane are extremely durable, they do not absorb vibrations as well as rubber. You will likely notice an increase in cabin noise and vibration (NVH) 🎬 See the pros and cons of using polyurethane mounts with this type of mount. This is a trade-off for improved performance and longevity.
| Brand Tier | Brands | Typical Price Range |
|---|---|---|
| Standard Replacement | Anchor, DEA, Westar, Pioneer | $10.99 - $20.00 |
| Performance/Heavy-Duty | Prothane, Lakewood | $25.00 - $34.29 |
Frequently Asked Questions (FAQ)
Is it hard to replace a transmission mount on a 1975-1985 LeSabre?
No, this is a relatively easy job for a DIY mechanic with basic tools. The mount is easy to access on these rear-wheel-drive cars. The process involves supporting the transmission with a jack, unbolting the old mount from the crossmember and transmission, and bolting the new one in place.
🎬 Watch: Step-by-step guide to replacing your transmission mountAre there any recalls for the transmission mount on this LeSabre?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database did not find any recalls or technical service bulletins (TSBs) specifically for the transmission mount on the 1975-1985 Buick LeSabre.
Should I replace my engine mounts at the same time?
It's a good idea to inspect your engine mounts when you replace the transmission mount. If they are the same age, they are likely worn as well. Worn engine mounts can put extra stress on the new transmission mount, causing it to fail prematurely. Replacing them all at once can save you time and labor in the long run.
Should I choose a rubber or polyurethane mount?
For a stock, daily-driven car, a standard rubber mount from a brand like Anchor or Westar is perfectly fine and will restore the original ride quality. If you have a modified engine, drive your car hard, or want a part that will last longer, a polyurethane mount from Prothane is a better choice, but be prepared for more vibration in the cabin.
Helpful Videos
Technical Specifications
The mount is typically a single-bolt design that attaches to the transmission tailshaft housing and a two-bolt design that attaches to the transmission crossmember. It is constructed of steel and either rubber or polyurethane.
We Have This Part in Stock
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.