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SERVICING AND MAINTENANCE 385
Fluid And Filter Changes — 6-Speed
Transmission
For the proper maintenance intervals Ú page 351.
In addition, change the fluid and filters if the fluid
b
e
comes contaminated (with water, etc.), or if the
transmission is disassembled for any reason.
Selection Of Lubricant
It is important to use the proper transmission fluid
to ensure optimum transmission performance and
life. Use only the manufacturer’s specified
transmission fluid
Ú page 433. It is important to
maintain the transmission fluid at the correct level
u
sing the recommended fluid. No chemical flushes
should be used in any transmission; only the
approved lubricant should be used.
REAR AXLE AND 4X4 FRONT DRIVING
A
XLE FLUID LEVEL
For normal service, periodic fluid level checks are
not required. When the vehicle is serviced for other
reasons the exterior surfaces of the axle assembly
should be inspected. If gear oil leakage is
suspected inspect the fluid level
Ú page 433. This
inspection should be made with the vehicle in a
le
vel position.
To check the axle fluid, park the vehicle on a level
surface. Take a piece of wire (or zip tie) and make
a 90 degree bend two inches from the end of the
wire. Insert the wire into the fill plug hole and use it
like a dipstick. Remove the wire and measure from
the 90 degree bend to the oil level.
For the 2500 (Non-Power Wagon) axles, the fluid
level should be 4/5 in ± 1/4 in (20.3 mm ±
6.
4 mm) below the fill hole for the rear axle and it
sh
ould be 1/4
in ± 1/4 in (6.4 mm ± 6.4 mm)
b
e
low the fill hole on the front axle.
For the 2500 Power Wagon and all 3500 model
axles, the fluid level should be 1/4 in ± 1/4 in
(6
.4 mm ± 6.4 mm) below the fill hole on the
9.
25
in front, 11.5 in rear axle, and 12.0 in rear
a
x
le.
Drain And Refill
For the proper maintenance intervals Ú page 351.
Lubricant Selection
For further information Ú page 433.
NOTE:
The presence of water in the gear lubricant will
re
sult in corrosion and possible failure of differ-
ential components. Operation of the vehicle in
w
ater, as may be encountered in some off-highway
types of service, will require draining and refilling
the axle to avoid damage.
Limited-Slip Differentials
DO REQUIRE limited slip
oil additive (friction modifiers).
NOTE:
Slight noise and mild shuddering may be evident
wh
ile turning a vehicle with limited slip differential
on concrete or dry pavement. These conditions
should be considered normal operation of the
limited slip differential.
TRANSFER CASE
Fluid Level Check
This fluid level can be checked by removing the
filler plug. The fluid level should be to the bottom
edge of the filler plug hole with the vehicle in a level
position.
CAUTION!
Using a transmission fluid other than the
manufacturer’s recommended fluid may cause
deterioration in transmission shift quality and/or
torque converter shudder, and (for six-speed
transmissions) will require more frequent fluid
and filter changes
Ú page 433.
8
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