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・Save up to 30%

Get a quote

What others are asking

Q: Front right blinker not working

Based on the lack of history, you most likely have a bad bulb or a corroded electrical socket connected to the bulb. A visual inspection of the contacts within the socket will determine the issue. In some rare cases, the...

Q: Gas leak

If the vehicle is leaking fuel, I would stop driving it immediately, and have it serviced as soon as possible. Gasoline is highly flammable, and therefore it is not safe to drive a vehicle that is leaking fuel. I would...

Q: Fuel and temperature gauges broken

Hello. There are a couple of reasons why this could be happening. One being that the instrument cluster is malfunctioning where the fuel gauge and temperature gauge are located. There is a circuit board on the back of your instrument...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...