Guide to the Automatic Transmission Mount for 1989-1994 Chevrolet Blazer
Stop the clunking and vibrations from your Blazer's drivetrain by understanding and choosing the right replacement transmission mount.
- A clunking noise when shifting is the most common symptom of a bad transmission mount.
- For most owners, a standard aftermarket brand like Anchor or Westar is a sufficient and cost-effective repair.
- Failure is due to age and wear; no specific recalls or TSBs exist for this part on the '89-'94 Blazer.
- It is highly recommended to inspect the two engine mounts at the same time, as they wear out together.
Is Your Blazer's Transmission Mount Failing?
On an older truck like the 1989-1994 S-10 Blazer, the original rubber transmission mount is well past its prime. When it fails, the transmission is no longer held securely, allowing it to move and shake more than it should. This leads to several distinct symptoms you might notice while driving.
Key Failure Symptoms:
🎬 Watch this video to see common bad transmission mount symptoms.- Clunking or Banging Noises: The most common sign is a loud "clunk" or "bang" when you shift gears (especially from Park to Drive or Reverse), accelerate hard, or brake suddenly. This is the sound of the transmission assembly moving excessively and hitting the vehicle's frame or crossmember.
- Excessive Vibration: A primary job of the mount is to absorb vibration. When it fails, you may feel a new or increased vibration through the floor, seats, or steering wheel. This is often most noticeable when the vehicle is in gear but stopped, like at a stoplight.
- Drivetrain Lurching: In severe cases, you might feel the entire engine and transmission assembly lurch or shift when you step on the gas. This indicates significant movement that should be addressed immediately.
Don't Ignore a Bad Mount
Continuing to drive with a failed transmission mount can cause more serious problems. The excessive movement puts extra stress on engine mounts, driveshaft components (like U-joints), and exhaust pipes, potentially leading to more expensive repairs down the road.
Choosing the Right Aftermarket Mount
For a vehicle like the '89-'94 Blazer, an aftermarket transmission mount is a practical and cost-effective choice. OEM mounts from GM are often difficult to find for vehicles of this age. Aftermarket brands offer several tiers of quality and price.
| Tier | Brands | Description |
|---|---|---|
| Standard Replacement | Anchor, Westar, DEA | These brands provide an economical, factory-style replacement. They are suitable for daily driving and normal use. Reviews are often mixed; some users report long life, while others experience premature failure or fitment issues. However, for a simple, low-tech part on an older truck, they are generally considered an acceptable option. |
| Enhanced Replacement | Pioneer | Pioneer mounts are sometimes regarded as being closer in quality to the original factory parts and may offer a better fit. They are a good mid-range option if you're willing to spend slightly more than the economy brands. |
Pro Tip: Inspect Engine Mounts at the Same Time
The engine and transmission mounts work together to support the drivetrain. A failed transmission mount often puts extra strain on the engine mounts, and vice-versa. It's highly recommended to inspect your two front engine mounts when replacing the transmission mount and replace them as a set 🎬 Learn how to replace the motor mounts on your S10. if they show signs of cracking or wear.
Known Issues, Recalls, and Bulletins
Searches of the National Highway Traffic Safety Administration (NHTSA) database and Technical Service Bulletins (TSBs) did not reveal any specific recalls or widespread issues directly related to the transmission mount for the 1989-1994 Chevrolet Blazer. Failures of this part are typically due to the age of the vehicle, mileage, and wear and tear on the rubber component.
Frequently Asked Questions (FAQ)
How can I visually inspect my transmission mount?
Safely support the vehicle on jack stands. The transmission mount is located on the crossmember directly underneath the back of the transmission. Look for deep cracks, separated rubber, or signs that the rubber has collapsed or is soaked in fluid. You can also have a helper shift the car from Drive to Reverse (with the brakes held firmly) while you observe the mount for excessive movement.
Is replacing a Blazer transmission mount a DIY job?
Yes, for a moderately experienced DIY mechanic, this is a feasible job. It involves supporting the transmission with a jack and a block of wood, unbolting the crossmember, and then unbolting the mount itself. It typically requires basic hand tools and can be completed in about an hour.
What's the difference between a 2WD and 4WD mount?
The transmission mount itself is often the same for both 2WD and 4WD models of this era. However, the replacement procedure on a 4WD truck can be slightly more complicated due to the presence of the transfer case and sometimes a skid plate that must be removed first. Always confirm the part fitment for your specific drivetrain.
Should I use a polyurethane mount instead of rubber?
Polyurethane mounts are available and are much more durable than rubber. However, they are also much stiffer and do not absorb vibrations as well. This means you will feel more drivetrain vibration and noise inside the cab. For a daily-driven truck, a standard rubber mount provides a more comfortable ride.
Helpful Videos
Technical Specifications
OEM Part Numbers: 15529520 15653110 22188245
The mount consists of a metal frame with a bonded rubber block. It typically attaches to the transmission with two studs and to the crossmember with two bolts. The design is consistent for both 2WD and 4WD models in this year range.
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.
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