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A number of possibilities which will need a more thorough analysis. Poorly balanced wheels and bad wheel bearings would be my first two suspects with the information I have.

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Q: Why does car shake when driving 40 mph?
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Can bad rotors cause a car to shake over 40 mph?

It would be highly unlikely.


What causes the front of the vehicle to shake when you are travelling 40 to 60 mph?

possibilityThe car is out of alignment or you have a wheel out of balance.


What causes a rumbling sound in the back of a car when driving above 40 mph?

the spare tyre.


If a car is driving at a constant speed of 40 mph how long will it take the car to travel 130 miles?

Divide the distance travelled by the speed...


If you are driving at 40 mph what should be the distance between cars?

A good rule of thumb is to keep a distance of one car length, about 10 feet, for every 10 mph of speed, so at 40 mph, you should be 40 feet behind the car in front of you. Obviously, this is harder to do in heavy traffic.


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If your car has a manual speedo, it can be in it or the cable. Noises have to be heard to be correctly diagnoised.


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At 40 mph, a car is traveling at about 58.6 feet per second.


How fast should you be going to put the car into 5th gear?

It would depend on the car you're driving and if you are driving up a grade or down a grade or on the level. On a level grade probably 40-45 mph would work.


Why does a freighliner century truck steering shake at 40-45 mph?

Tires and/or wheels out of balance?


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Why Loud engine noise at 60 mph then 40 mph when driving?

My car had the same symptoms, got loud at 40, quieted at faster speeds, then got loud again at 60. It turned out to be a problem with the wheel bearings. They replaced the assembly in one of the wheels, $220, and the car sounds normal again.