Skip the auto shop - Our mechanics make house calls

Q: What would cause a heavy shake when the van is just about to shift under a load? Speed does not matter.

asked by on

This van has new heads (she got it hot, just trying to be thorough) and does not show any codes. but as the van accelerates, like when starting to climb a hill in overdrive, the van shakes like crazy. After it shifts and the RPMs get higher the shake immediately goes away and it runs like a dream. To be clear there is no power loss or miss. It, to me, seems like it is not inside the engine. maybe CV shaft or drive-train. This can happen at any speed but on the route I drove it occurred at 25 mph and 67 mph. I am looking for ideas on where to look before I take this in to get raped.Thank you in advance.

My car has 180000 miles.
My car has an automatic transmission.

A: Hi there: In many cases, the symptoms you’...

Hi there:

In many cases, the symptoms you’re describing can be caused by loose motor mounts, steering stabilizer bars, or other front end suspension components. If the shaking occurs during shifting of the transmission, it could be a harmonic balancer issue or drive shaft that has fallen out of calibration. My suggestion is contact a local mechanic who can come to your home and complete a vehicle is vibrating inspection first. This service will allow them to pinpoint the source of the vibration so that the right repairs can be made; without the guess work.

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!

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: acts locked up

It's possible there is engine damage, based on the suddenness of the failure. If you suspect the starter pinion gear is jammed in the ring gear on the flex plate, remove the starter. Remove all of the spark plugs and...

Q: Losing Oil

There can be can be a few reasons for the vehicle to use excessive oil. There would first need to be a few questions answered before a determination is made about the engine using too much oil. The first...

Q: My horn switch is not working would like to change to push button instead and need help locating the wire in the steering column.

I would recommend consulting a wiring diagram for this particular modification. Wiring diagrams are available in Chilton or Haynes service manuals. You can pick up one of these books at all of your local auto parts stores for the particular...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.