Technical data

Black plate (11,1)
Chevrolet/GMC Duramax Diesel Supplement (GMNA Localizing-U.S./Canada-
7132827) - 2015 - CRC - 10/21/14
Vehicle Care 10-11
Hot Check Procedure
The fluid must be hot to ensure an
accurate check. The fluid level rises
as temperature increases.
1. Operate the transmission in D
(Drive) until the normal operating
temperature of 71°C (160°F) to
93°C (200°F) is reached.
2. Pull out the dipstick and wipe it
with a clean rag or paper towel.
3. Push it back in all the way, wait
three seconds and then pull it
back out again. Repeat the
check procedure to verify the
reading.
4. Safe operating level is within the
HOT band on the dipstick. The
width of the HOT band
represents approximately 1.0 L
(1.06 qt) of fluid at normal
operating temperature.
5. If the fluid level is not within the
HOT band, add or drain fluid as
necessary to bring the fluid level
to within the HOT band.
6. If the fluid level is in the
acceptable range, push the
dipstick back in all the way.
Consistency of Readings
Always check the fluid level at least
twice using the procedures
described previously. Consistency is
important to maintaining proper fluid
level. If inconsistent readings
persist, check the transmission
breather to be sure it is clean and
unclogged. If readings are still
inconsistent, contact the dealer.
How to Add Fluid
In cold operation, Allison
recommends using Synthetic
Transmission Fluid approved to
Allison Transmission specification
TES-295 in areas where the
minimum ambient temperatures are
below −40°C (−40°F).
Refer to the Maintenance Schedule
to determine what kind of
transmission fluid to use. See
Recommended Fluids and
Lubricants on page 11-8.
Add fluid only after checking the
transmission fluid while it is hot.
A cold check is used only as a
reference. If the fluid level is low,
add only enough of the proper fluid
to bring the level up to the HOT area
for a hot check. It does not take
much fluid, generally less than 0.5 L
(1 pt). Do not overfill.
{
Caution
Use of the incorrect automatic
transmission fluid may damage
the vehicle, and the damage may
not be covered by the vehicle
warranty. Always use the
automatic transmission fluid listed
in Recommended Fluids and
Lubricants on page 11-8.
.
After adding fluid, recheck the
fluid level as described under
“How to Check.”
.
When the correct fluid level is
obtained, push the dipstick back
in all the way.