2. Run the engine until the transmission fluid
reaches the operating temperature of 160 to
200°F (71 to 93°C). Shift the transmission to
neutral (N) and shut down the engine.
CAUTION
To prevent dirt from entering the transmission,
use only clean containers and fillers for the trans-
mission fluid. Do not use fillers or containers that
have been used for water or antifreeze. Dirt, water,
or antifreeze could damage the transmission.
3. Clean the area around the drain plug. While the
transmission fluid is warm, remove the magnetic
drain plug and drain the fluid. See Fig. 16.
NOTE: The transmission should drain about 7.9
quarts (7.5 L).
IMPORTANT: Examine the used transmission
fluid for dirt, coolant or water, and metal par-
ticles. If any of these contaminants are present,
a problem may exist within the transmission
system.
4. Replace the filter. It is located on the passenger-
side of the vehicle.
4.1 Place a drain pan under the transmission
fluid filter.
CAUTION
To prevent skin burns from hot transmission fluid,
wear protective gloves when removing the filter.
4.2 Place a strap or chain wrench around the
filter canister, and rotate in a counter-
clockwise motion to separate the filter
from the mounting. Carefully spin the filter
off the mount and remove it from the ve-
hicle.
4.3 Apply a light coat of transmission fluid to
the O-ring gasket on the new filter. Fill the
filter with the specified transmission fluid,
and spin the filter back onto the mount.
NOTE: The filter fills slowly, so be patient to
ensure the proper fluid level has been
reached.
4.4 Once the filter has made contact with the
mount, use a strap or chain wrench to
rotate the filter canister an additional 180
to 270 degrees to firmly tighten the filter.
Wipe the filter clean of any fluid after it is
tightened.
5. Clean the plug before installing it.
6. Clean drain plug threads in the tank.
7. Install the plug. Tighten 32 lbf·ft (43 N·m).
8. Remove the transmission fluid dipstick.
9. Prepare 11 quarts (10 L) of Dexron
®
III automatic
transmission fluid (ATF).
10. Through the dipstick tube, fill the transmission
with Dexron
®
III, about 7.4 quarts (7 L).
11. Inspect the low temperature ATF level.
11.1 Make sure the vehicle is in neutral and
start the engine.
11.2 Let the engine idle and successively shift
positions to spread ATF throughout the
transmission.
11.3 Set the shift selector to neutral (N).
11.4 Continue engine idle and remove the dip-
stick. Wipe it clean, re-insert it, remove it
and measure the ATF level.
11.5 If the ATF temperature is between 68 and
86° F (20 and 30° C), the fluid should
measure in the COLD range. See
Fig. 17.
11.6 Refill the ATF until it reaches the appro-
priate range.
06/17/99
f261021
A
A. Drain Plug
Fig. 16, Aisin Transmission Drain Plug
Transmission 26
Business Class Trucks Maintenance Manual, February 2003 26/17
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