Everything you need to know about a transmission flush
Incidental things you should know about a transmission
A transmission fluid flush is different
fluid and filter change.
A fluid flush will
not repair an internal transmission problem.
A fluid flush is a preventative
maintenance procedure, not a cure
A flush is not recommended for certain
high mileage vehicles.
A transmission flush is typically performed
using a flush machine.
A transmission flush can be performed (DIY) using the
What is a transmission flush?
A transmission flush is a
process in which the fluid in an automatic transmission is flushed
out of the transmission and replaced with new ATF. The
flushing process, when done correctly, replaces nearly 100% of the
old fluid with new fluid, including fluid in the torque converter
and oil cooler lines.
- PLEASE READ CAREFULLY:
A transmission flush is not recommended for high mileage
vehicles that have not been flushed previously.
For these vehicles, the recommended service is a
fluid and filter change.
Should I have my transmission flushed?
debate as to the effectiveness and safety of a transmission flushcontinues
among industry professionals. Some transmission experts give a thumbs up to flushing
while others are completely against it.
As expected, the industry professionals who
provide transmission flushes in their shops are proponents of the
service while the non-flushing shops are typically against it. As a publisher of
non-biased information, we'll do our best to sort through the
rhetoric and provide you with the information you need to make an
Flush (Using Pressure Machine) - The Pros and Cons
The #1 benefit of a fluid
flush is that nearly all the fluid (normally between 10 and 12 quarts) is
flushed from the transmission and replaced with clean fresh fluid.
In this process, metal shavings, buildup and debris is also flushed
from the transmission, torque converter and oil cooler lines, which
is also a good thing. Clean ATF insures the transmission is
well lubricated and helps keep the tranny cool.
||According to ATRA (Automobile
Transmission Rebuilders Association), roughly
9 out of 10 transmission failures are caused by old,
contaminated and/or oxidized transmission fluid.
Therefore, keeping your transmission full of clean fresh
ATF crucial to its continued performance.
Is a transmission flush safe
Anyone familiar with the
subject of a transmission flush has undoubtedly heard stories from
car owners about how a flush damaged their transmission. While
some of these stories may be accurate others are questionable or
even completely inaccurate.
As mentioned at the beginning
of this knowledge article, a transmission flush can be performed by
a repair shop using a flush machine or as a DIY project using the
transmission's internal pump to flush the old fluid out and the new
fluid in. In almost every case, when a vehicle owner states that his
or her transmission failed shortly after a flush was performed the
flush was done using a high-pressure flush machine at a repair
facility. Here's why:
A transmission flush
machine uses high pressure along with a cleaning agent to flush the
old fluid out of the transmission while simultaneously cleaning the
internal parts. During this process, the high-pressure
cleaning does such a thorough job that it dislodges dirt and debris
that the transmission’s internal pump is not strong enough to do.
If, while being flushed through the transmission, a piece of debris
becomes lodged in a more crucial are of the transmission it can
cause problems, even catastrophic transmission failure.
High-pressure flushing machines can also blow out internal seals in
High mileage vehicles that have not routinely had transmission
flushes performed are at the greatest risk of damage resulting from
a high-pressure flush.
For high-mileage vehicles that have not routinely been flushed, A
using the transmission's oil pump or a
fluid and filter change is the appropriate service.
Where to have your transmission flushed
Many, but not all,
transmission repair shops and automobile dealership service centers
offer a transmission fluid flush service.