Skip the auto shop - Our mechanics make house calls

Q: Car slams into gear after having transmission flushed

asked by on

I had my transmission fluid flushed and ever since then, when the car switches gears, it feels like it slams into gear (more than it used to before). It doesn't happen all the time, or between every gear shift, but it feels much more noticeable lately. Is it possible that the mechanic used a low grade fluid replacement? Or is it just me being more sensitive to it?

A: Sometimes, on older and/or high mileage tra...

Sometimes, on older and/or high mileage transmissions, a fluid flush can be detrimental. The old fluid (which is full of friction material from the transmission clutches) is all that is holding the transmission together. However, this may not be the case with your vehicle. There is a TSB 08-07-30-002A for your Buick which states harsh shifting may be caused by problem with the valve body. Since the valve body is used to direct fluid flow to the transmission, it’s possible that your transmission flush exacerbated this problem.

Other potential cause for your symptoms include a low fluid level (if the shop didn’t add the correct amount), faulty accumulator, incorrect line pressure, and more. The list or potential causes is quite lengthy, so I suggest you have a trained professional inspect your vehicle firsthand to pinpoint your shifting problem.

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: Ignition system is not working.

When you are experiencing problems with starting your vehicle, we first want to address the life of the components that aid in starting the vehicle up. It was mentioned that you have a new ignition system installed and that it...

Q: check engine light when headlights on.

The best thing to do is read the code that is being output by the ECM and that is causing the check engine light to come on. In 1981, of course, the number of codes output was very limited but...

Q: blower for heat and air

This is caused by a shorted blower resistor. Replace the resistor and it should fix the problem you're having. The resistor is next to the blower motor, located under right side of the dash. If you need some help with...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...