Dodge RAM TRUCK 1500 1995 Service Manual page 1380

B R
42RH/46RH/47RH AUTOMATIC TRANSMISSION 21 - 97
4 2 R H / 4 6 R H / 4 7 R H
AUTOMATIC
T R A N S M I S S I O N
CONTENTS
page page
42RH/46RH/47RH TRANSMISSION CONTROLS
AND OPERATION . 103
42RH/46RH/47RH TRANSMISSION DIAGNOISIS
AND TESTING 106
42RH/46RH/47RH TRANSMISSION IN-VEHICLE
SERflCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
42RH/46RH/47RH TRANSMISSION/OVERDRIVE
REMOVAL AND INSTALLATION . . 153
42RH TRANSMISSION OVERHAUL . . . .
46RH/47RH TRANSMISSION OVERHAUL
42RH/46RH/47RH OVERDRIVE UNIT
OVERHAUL . . . . . . . . . . . . . . . . . . . . .
GENERAL INFORMATION . . . . . . . . . . .
. . . 159
. . . 204
25i
. 97
GENERAL INFORMATION
INDEX
page
Components Unique to 47RH , . . 100
Fourth Gear Overdrive Components 101
Gear Ratios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Recommended Fluid 100
Temperature Sensor and Indicator Lamp . 100
TRANSMISSION DESCRIPTION
Chrysler 42RH/46RH/47RH transmissions are
4-speed automatic transmissions. Fourth gear is an
overdrive range in each model.
The 42RH is used with 3.9L engines in 4x2 1500
models. The 46RH is used with 3.9L, 5.2L, and 5.9L
gas engines. The 47RH is used with VIO and Cum­
mins diesel engines only.
The 42RH/46RH/47RH are all dual unit designs.
The assembly consists of an automatic transmission
with an overdrive unit attached at the rear (Figs. 1
and 2). First through third gear ranges are provided
by the clutches, bands, overrunning clutch and plan­
etary gear set in the transmission. Fourth gear range
is provided by the overdrive unit. Overdrive ratio is
0.69:1. •
The overdrive unit contains an overdrive clutch, di­
rect clutch, planetary gear set and overrunning
page
Torque Converter . . . . . . . . . . . . . . . . . . . . . . . . 100
Transmission Changes and Parts Interchangeability . 102
Transmission Description . . . . . . . . . . . . . . . . . . . . 97
Transmission Identification . 101
clutch. The overdrive clutch is applied in fourth gear
only. The direct clutch is applied in all ranges except
fourth gear.
The governor and park lock assemblies are located
inside the overdrive unit. The unit must be removed
and disassembled for service access to the park lock
and governor components.
Fourth gear is controlled by a manually operated
switch in the instrument panel. The switch is in cir­
cuit with the overdrive solenoid (on the valve body)
and the powertrain control module. In the On posi­
tion, current flows through the switch to the solenoid
for the 3-4 shift sequence. The transmission must be
in third gear before a 3-4 upshift will occur.
The overdrive solenoid will not be energized and a
3-4 upshift will not occur when the control switch is
in the OFF position.