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Transmission and transfer case » AW-4 automatic transmission » Description and operation
Fluid

NOTE: Refer to the maintenance schedules in Group 0, Lubrication and Maintenance for the recommended maintenance (fluid/filter change) intervals for this transmission.

NOTE: Refer to Service Procedures in this group for fluid level checking procedures.

DESCRIPTION

Mopart Dexron IIE/Mercon is the recommended fluid for the AW-4 automatic transmissions.

Fig. 3 First/Second/Third/Reverse Gear Components
Fig. 3 First/Second/Third/Reverse Gear Components

1 - 2ND COAST BRAKE
2 - DIRECT CLUTCH
3 - FORWARD CLUTCH
4 - FRONT PLANETARY RING GEAR
5 - SECOND BRAKE
6 - FIRST/REVERSE BRAKE
7 - REAR PLANETARY CARRIER
8 - REAR PLANETARY RING GEAR
9 - OUTPUT SHAFT
10 - FRONT & REAR PLANETARY SUN GEAR
11 - ONE-WAY CLUTCH NO. 2
12 - ONE-WAY CLUTCH NO. 1
13 - FRONT PLANETARY CARRIER
14 - INPUT SHAFT

Fig. 4 Fourth Gear Overdrive Components
Fig. 4 Fourth Gear Overdrive Components

1 - CLUTCH
2 - BRAKE
3 - RING GEAR
4 - PLANETARY CARRIER
5 - SUN GEAR
6 - ONE-WAY CLUTCH
7 - INPUT SHAFT

Dexron II fluid IS NOT recommended. Clutch chatter can result from the use of improper fluid.

Mopart Dexron IIE/Mercon automatic transmission fluid when new is red in color. The ATF is dyed red so it can be identified from other fluids used in the vehicle such as engine oil or antifreeze. The red color is not permanent and is not an indicator of fluid condition.

As the vehicle is driven, the ATF will begin to look darker in color and may eventually become brown. This is normal. A dark brown/black fluid accompanied with a burnt odor and/or deterioration in shift quality may indicate fluid deterioration or transmission component failure.

FLUID ADDITIVES

DaimlerChrysler strongly recommends against the addition of any fluids to the transmission, other than those automatic transmission fluids listed above.

Exceptions to this policy are the use of special dyes to aid in detecting fluid leaks.

Various "special" additives and supplements exist that claim to improve shift feel and/or quality. These additives and others also claim to improve converter clutch operation and inhibit overheating, oxidation, varnish, and sludge. These claims have not been supported to the satisfaction of DaimlerChrysler and these additives must not be used. The use of transmission "sealers" should also be avoided, since they may adversely affect the integrity of transmission seals.

OPERATION

The automatic transmission fluid is selected based upon several qualities. The fluid must provide a high level of protection for the internal components by providing a lubricating film between adjacent metal components. The fluid must also be thermally stable so that it can maintain a consistent viscosity through a large temperature range. If the viscosity stays constant through the temperature range of operation, transmission operation and shift feel will remain consistent.

Transmission fluid must also be a good conductor of heat. The fluid must absorb heat from the internal transmission components and transfer that heat to the transmission case.

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