2006 DODGE RAM SRT-10 Service Repair Manual

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Page 2913 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 42RLE Automatic Transmission

Page 2914 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual The 42RLE is a four-speed transmission that is a conventional hydraulic/mechanical assembly controlled with adap-
tive electronic controls and monitors. The hydraulic system of the transmission consis

The 42RLE is a four-speed transmission that is a conventional hydraulic/mechanical assembly controlled with adap-
tive electronic controls and monitors. The hydraulic system of the transmission consists of the transmission fluid,
fluid passages, hydraulic valves, and various line pressure control components. An input clutch assembly which
houses the underdrive, overdrive, and reverse clutches is used. It also utilizes separate holding clutches: 2nd/4th
gear and Low/Reverse. The primary mechanical components of the transmission consist of the following:
Three multiple disc input clutches
Two multiple disc holding clutches
Four hydraulic accumulators
Two planetary gear sets
Hydraulic oil pump
Valve body
Solenoid/Pressure switch assembly
Control of the transmission is accomplished by fully adaptive electronics. Optimum shift scheduling is accomplished
through continuous real-time sensor feedback information provided to the Transmission Control Module (TCM) por-
tion of the Powertrain Control Module (PCM).
The TCM is the heart 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. With this information,
the TCM can calculate and perform timely and quality shifts through various output or control devices (solenoid
pack, transmission control relay, etc.).
The TCM also performs certain self-diagnostic functions and provides comprehensive information (sensor data,
DTC’s, etc.) which is helpful in proper diagnosis and repair. This informationcanbeviewedwiththescantool.
TRANSMISSION IDENTIFICATION
The 42RLE transmission can be identified by a bar-
code label that is affixed to the upper left area of the
bellhousing.
The label contains a series of digits that can be trans-
lated into useful information such as transmission part
number (10), date of manufacture (4, 5), manufactur-
ing origin (2), assembly line identifier (6), build
sequence number (7), etc..
If the tag is not legible or is missing, the “PK” number,
which is stamped into the left rear flange of the trans-
mission case, can be referred to for identification. The
entire part number, build code, and sequence number
are stamped into the flange.
OPERATION
The 42RLE transmission ratios are:
1 - DRIVEPLATE 6 - REVERSE CLUTCH 11 - STUB SHAFT
2 - TORQUE CONVERTER 7 - FRONT PLANET CARRIER 12 - LOW/REVERSE CLUTCH
3 - INPUT SHAFT 8 - REAR PLANET CARRIER 13 - 2/4 CLUTCH
4 - UNDERDRIVE CLUTCH 9 - OUTPUT SHAFT 14 - OIL PUMP
5 - OVERDRIVE CLUTCH 10 - SNAP RING

Page 2915 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual First 2.84 : 1
Second 1.57 : 1
Third 1.00 : 1
Overdrive 0.69 : 1
Reverse 2.21 : 1
FIRST GEAR POWERFLOW
In first gear range, torque input is through the underdrive clutch (1) to the underdrive hub asse

Page 2916 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual SECOND GEAR POWERFLOW
Second gear is achieved by having both planetary gear sets contribute to torque multiplication. As in first gear,
torque input is through the underdrive clutch (1) to the rear su

Page 2917 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual THIRDGEARPOWERFLOW
In third gear, two input clutches are applied to provide torque input: the underdrive clutch (1) and overdrive clutch
(2). The underdrive clutch rotates the rear sun gear, while the

Page 2918 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual FOURTHGEARPOWERFLOW
In fourth gear input torque is through the overdrive clutch (1) which drives the front carrier. The 2/4 clutch (2) is
applied to hold the front sun gear. As the overdrive clutch ro

Page 2919 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual REVERSE GEAR POWERFLOW
In reverse, input power is through the reverse clutch (1). When applied, the reverse clutch drives the front sun gear
through the overdrive hub and shaft. The L/R clutch (2) is

Page 2920 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual Dynamic conditions (acceleration, deceleration, upshift, cornering)
Elements in use when condition occurs (what gear is transmission in duringcondition)
Road and weather conditions
Any other useful di

Dynamic conditions (acceleration, deceleration, upshift, cornering)
Elements in use when condition occurs (what gear is transmission in duringcondition)
Road and weather conditions
Any other useful diagnostic information.
After noting all conditions, check the easily accessible variables:
Fluid level and condition
Shift cable adjustment
Diagnostic trouble code inspection
Then perform a road test to determine if the problem has been corrected or that more diagnosis is necessary. If the
problem exists after the preliminary tests and corrections are completed, hydraulic pressure checks should be per-
formed.
ROAD TEST
Prior to performing a road test, verify that the fluid level, fluid condition, and linkage adjustment have been
approved.
During the road test, the transmission should be operated in each positionto check for slipping and any variation in
shifting.
If the vehicle operates properly at highway speeds, but has poor acceleration, the converter stator overrunning
clutch may be slipping. If acceleration is normal, but high throttle opening is needed to maintain highway speeds,
the converter stator clutch may have seized. Both of these stator defects require replacement of the torque con-
verter and thorough transmission cleaning.
Slipping clutches can be isolated by comparing the “Elements in Use” chartwith clutch operation encountered on a
road test. This chart identifies which clutches are applied at each position of the selector lever.
A slipping clutch may also set a DTC and can be determined by operating the transmission in all selector positions.
ELEMENTS IN USE AT EACH POSITION OF SELECTOR LEVER
Shift Lever
PositionINPUT CLUTCHES HOLDING CLUTCHES
Underdrive Overdrive Reverse 2/4 Low/Reverse
P-PARKX
R-REVERSE X X
N - NEUTRALX
OD -
OVERDRIVE
First XX
Second X X
Direct X X
Overdrive X X
D - DRIVE*
First XX
Second X X
Direct X X
L-LOW*
First XX
Second X X
Direct X X
* Vehicle upshift and downshift speeds are increased when in these selector positions.
The process of elimination can be used to detect any unit which slips and to confirm proper operation of good units.
Road test analysis can diagnose slipping units, but the cause of the malfunction cannot be determined. Practically
any condition can be caused by leaking hydraulic circuits or sticking valves.

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