System Description

DESCRIPTION

CAUTION: The AS68RC Transmission uses a unique automatic transmission fluid. MOPAR(R) AS68RC ATF is the only recommended fluid. Failure to follow this caution will result in damage to the transmission.

TRANSMISSION COMPONENTS





AS68RC COMPONENTS







The AS68RC six speed automatic transmission displays durability characteristics required in the truck and bus industries, while serving fundamental roles in improving vehicle performance through a new gear train and a multi disc lock up clutch. Other features include better braking performance, higher torque capacity with less weight, smoother shift quality while attaining high reliability.


The hydraulic control mechanism utilizes direct control of main pressure by use of a linear solenoid.


The primary mechanical components of the transmission consist of the following:

- Three sets of clutch packs
- Two sets of brake packs
- A one way clutch
- Three planetary gear sets
- Single stage, three element, two phase type torque converter.
- Valve body
- Linear solenoids
- Shift solenoids
- Oil Pump

The Transmission Control Module (TCM) is the "heart" or "brain" of the electronic control system and relies on information from various direct and indirect inputs (sensors, switches, etc.) to determine driver demand and vehicle operating conditions. Depending on the vehicle configuration, the TCM may be a stand-alone module or it may be housed along with the Powertrain Control Module (PCM) in a single module. With this information, the TCM can calculate and perform timely and quality shifts through various output or control devices.


TRANSMISSION IDENTIFICATION






Transmission identification numbers are located on top of the torque converter housing. Refer to this information when ordering replacement parts.The label gives additional information which may also be necessary for identification purposes.


GEAR RATIOS

The AS68RC gear ratios are:
1st -3.74:1
2nd -2.00:1
3rd -1.34:1
4th -1.00:1
5th -0.77:1
6th -0.63:1
Reverse--3.54:1

THRUST BEARING ORIENTATION





THRUST BEARING ORIENTATION







CAUTION: A thrust bearing must be installed correctly. Failure to heed this caution will result in transmission failure.

When installing a thrust bearing, be certain the rolled surface (outer race) of the thrust bearing contacts the rolled surface of the component.