Jeep 1996 Grand Cherokee Service Manual - page 1143
TRANSMISSION IDENTIFICATION
Transmission identification numbers are stamped
on the left side of the case just above the oil pan gas-
ket surface (Fig. 2). Refer to this information when
ordering replacement parts.
RECOMMENDED FLUID
Mopar ATF Plus, Type 7176 automatic transmis-
sion fluid is the recommended fluid for Chrysler
automatic transmissions.
Dexron II fluid IS NOT recommended. Clutch
chatter can result from the use of improper
fluid. If Mopar ATF Plus is not available, Dexron II
can be used as a supplement if the vehicle must be
driven.
TORQUE CONVERTER—ELECTRONIC CLUTCH
The torque converter is a hydraulic device that
couples the engine crankshaft to the transmission.
The torque converter consists of an outer shell with
an internal turbine, a stator, an overrunning clutch,
an impeller, and an electronically applied converter
clutch. Torque multiplication is created when the sta-
tor directs the hydraulic flow from the turbine to
rotate the impeller in the direction the engine crank-
shaft is turning. The turbine transfers power to the
planetary gear sets in the transmission. The transfer
of power into the impeller assists torque multiplica-
tion. At low vehicle-speed, the overrunning clutch
holds stator stationary (during torque multiplication)
and allows the stator to freewheel at high vehicle
speed. The converter clutch provides reduced engine
speed and greater fuel economy when engaged.
Clutch engagement also provides reduced transmis-
sion fluid temperatures. The converter clutch is
engaged in fourth gear and in third gear when the
overdrive switch is OFF. The torque converter hub
drives the transmission oil (fluid) pump.
The torque converter is a sealed, welded unit that
is not repairable and is serviced as an assembly.
CAUTION: The torque converter must be replaced if
a transmission failure resulted in large amounts of
metal or fiber contamination in the fluid. If the fluid
is contaminated, flush the fluid cooler and lines.
TRANSMISSION GEAR RATIOS
42/44 RE forward gear ratios are:
• 2.74:1 (first gear)
• 1.54:1 (second gear)
• 1.00:1 (third gear)
• 0.69:1 (forth gear)
• 2.21 (reverse)
GEARSHIFT MECHANISM
The shift mechanism is cable operated and pro-
vides six shift positions. The shift indicator is located
on the steering column forward of the steering wheel.
The shift positions are:
• Park (P)
• Reverse (R)
• Neutral (N)
• Drive (D)
• Manual Second (2)
• Manual Low (1)
Manual low (1) range provides first gear only.
Overrun braking is also provided in this range. Man-
ual second (2) range provides first and second gear
only. Drive range provides first, second, third, and
overdrive fourth gear ranges. The shift into overdrive
fourth gear range occurs only after the transmission
has completed the shift into (D) third gear range. No
further movement of the shift mechanism is required
to complete the 3-4 shift.
DESCRIPTION AND OPERATION
ELECTRONIC GOVERNOR
Governor pressure is controlled electronically. Com-
ponents used for governor pressure control include:
• Governor body
• Valve body transfer plate
• Governor pressure solenoid valve
• Governor pressure sensor
• Fluid temperature thermistor
• Throttle position sensor (TPS)
• Transmission speed sensor
• Powertrain control module (PCM)
GOVERNOR PRESSURE SOLENOID VALVE
The solenoid valve regulates the governor pressure
needed for upshifts and downshifts. It is an electro-
Fig. 2 Transmission Part And Serial Number
Location
21 - 4
TRANSMISSION AND TRANSFER CASE
ZJ
GENERAL INFORMATION (Continued)