Gmc 2007 Sierra User Manual Page 494

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Automatic Transmission Fluid
(Allison Transmission
®
)
When to Check and Change Automatic
Transmission Fluid
A good time to check your automatic transmission
fluid level is when the engine oil is changed.
Change the fluid and filter at the intervals listed in
Additional Required Services (Gasoline Engine)
on page 621, and be sure to use the transmission
fluid listed in Recommended Fluids and
Lubricants on page 629.
How to Check Automatic Transmission
Fluid
Because this operation can be a little difficult, you
may choose to have this done at the dealership
service department.
If you do it yourself, be sure to follow all the
instructions here, or you could get a false reading
on the dipstick.
Notice: Too much or too little fluid can
damage your transmission. Too much can
mean that some of the fluid could come out
and fall on hot engine parts or exhaust system
parts, starting a fire. Too little fluid could
cause the transmission to overheat. Be sure to
get an accurate reading if you check your
transmission fluid.
Wait at least 30 minutes before checking the
transmission fluid level if you have been driving:
When outside temperatures are above
90°F (32°C).
At high speed for quite a while.
In heavy traffic — especially in hot weather.
While pulling a trailer.
Checking the Fluid Level
Prepare your vehicle as follows:
1. Park your vehicle on a level place. Keep the
engine running.
2. With the parking brake applied, place the shift
lever in PARK (P).
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