Dodge ram truck 3500 1996 Service Manual page 1493

B R AUTOMATIC TRANSMISSION—4znc
SCHEMATICS AND DIAGRAMS SPECIAL TOOLS
HYDRAULIC SCHEMATICS 228 RE TRANSMISSION . 242
SPECIFICATIONS
TRANSMISSION 240
G E N E R A L I N F O R M A T I O N
42RE TRANSMISSION
The 42RE is a four speed fully automatic transmis­
sion (Fig. 1) with an electronic governor. First
through third gear ranges are provided by the
clutches, bands, overrunning clutch, and planetary
gear sets in the transmission. Fourth gear range is
provided by the overdrive unit that contains an over­
drive clutch, direct clutch, planetary gear set, and
overrunning clutch. The overdrive clutch is applied in
fourth gear only. The direct clutch is applied in all
ranges except fourth gear. The 42RE is equipped
with a lock-up clutch in the torque converter. The
torque converter clutch is controlled by the Power-
train Control Module (PCM). The torque converter
clutch is hydraulically applied and is released when
fluid is vented from the hydraulic circuit by the
torque converter control (TCC) solenoid on the valve
body. The torque converter clutch engages in fourth
gear, and in third gear when the O/D switch is OFF.
Engagement occurs when the vehicle is cruising on a
level plane after the vehicle has warmed up. The
torque converter clutch disengages when the acceler­
ator is applied. The torque converter clutch feature
increases fuel economy and reduces the transmission
fluid temperature. The 42RE transmission is cooled^
by an integral fluid cooler inside the radiator.