Skip the auto shop - Our mechanics make house calls

Q: Car sluggish after 40 MPH

asked by on

My car drives fine while in First and Second gear, but once I reach 40 MPH, the transmission seems to slip, and the car loses some of its power and seems sluggish.

The transmission seems to be slipping internally. The 3-4 clutches are most likely bad, causing the transmission to slip. The transmission would likely need to be overhauled or replaced. I recommend that you have a mechanic, like the ones from YourMechanic, come by to diagnose the cause of your car’s sluggish running, and recommend a repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Car sluggish after 40 MPH

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car started making noise that sounded like a flock of birds in my glove box.

You need to have your blower motor filter removed and see if it has fallen apart and got caught up in the blower motor. You may need to have the blower motor removed and replaced if it is not any...

Q: At idle, my car uncontrolably surges rpm up to 2500rpms.

Hi Kate, Try checking themass air flow sensor as this will definitely cause engine surging problems when it is dirty or has a poor connection. This may also explain the raw fuel smell as well. As you may know, the...

Q: 2011 Ford Fusion won't shift gears.

The first thing to check would be the transmission fluid level. If the fluid level is low from a leak, this may cause the transmission to slip and when revved to higher rpm it may jerk when the line pressure...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...