Q: Is a flush okay for an older transmission? Or should you stick with a drain and fill.

asked by on

My truck has 124K on it. I have heard both sides of the coin. A flush could loosen up deposits and cause you more issues, or complete failure, but it makes sense to flush it as well. As far as I know, the previous owner never changed the trans fluid. Can I go with a flush or just a drain and fill to be safe?

Most transmission repair shops and mechanics that say they are flushing your transmission are really just transferring your fluid out and new fluid into your transmission. This fluid transfer will take twice the amount of fluid that a normal drain and fill of the transmission does. A drain and fill will only replace about 1/2 of the fluid that is in the transmission. I would recommend having the fluid transfer method to replace most of the fluid.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Is a flush okay for an older transmission? Or should you stick with a drain and fill.

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: Used torque converter that came with Transmission and won't change into high gear.

Hi there. A worn torque converter will not cause the transmission to just loose the top gears only. A worn torque converter will cause the transmission to not drive or to have a lack of power to the wheels. The...

Q: Q: how many Catalytic converters are on my car?

Claimed by Jeff Engstrom

Q: Truck will act like it is not getting enough fuel when cruisng. RPMs drop then comes back up or under load

Hello. I think you have called it, this is almost certainly a fuel supply issue. Installing a fuel pump pressure gauge which can be observed while driving will confirm this. Sources could include a worn out fuel pump, a fuel...

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 Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...