Failing Engine Mounts Cause Costly Transmission Damage

Ignoring early warning signs of engine mount failure can lead to $800+ repair bills for transmission repairs.

Published on Feb. 12, 2026

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Failing engine mounts can gradually cause misalignment between the engine and transmission, leading to sluggish shifting and other transmission issues. Most drivers don't realize the problem until complete mount failure occurs, resulting in expensive repairs that could have been prevented with proactive maintenance.

Why it matters

Engine mounts play a critical role in keeping the powertrain properly aligned, and their gradual failure can create a domino effect of damage to other drivetrain components like the transmission. Recognizing the early warning signs and addressing mount issues proactively can save car owners hundreds or even thousands in repair costs.

The details

Engine mounts are responsible for absorbing thousands of pounds of torque and vibration, but they deteriorate over time. As the mounts fail, the engine can become misaligned with the transmission input shaft, causing sluggish and rough shifting. This misalignment can also stress other components like CV joints and transmission seals, leading to even more expensive repairs. Replacing just the engine mounts typically costs $400-800, but the related damage can quickly balloon the repair bill to over $800.

  • Engine mounts typically last 60,000-100,000 miles, but aggressive driving or stop-and-go traffic can accelerate deterioration.
  • Symptoms of failing engine mounts, like sluggish shifting and vibrations, often worsen gradually over time.

The players

Annemarije de Boer

A Los Angeles-based director and visual storyteller specializing in technology reviews and digital innovation journalism.

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What they’re saying

“That subtle vibration during acceleration isn't normal—it's your engine mount dying a slow death beneath your hood. You dismiss it as road noise or chalk it up to your car's age, but those failing mounts are quietly sabotaging your transmission's performance.”

— Annemarije de Boer, Author (gadgetreview.com)

What’s next

Have your engine mounts inspected during routine maintenance to catch any issues early and prevent more costly transmission damage.

The takeaway

Proactively addressing failing engine mounts can save car owners hundreds or even thousands in repair costs by preventing secondary damage to the transmission and other drivetrain components.