Fluid Level Check Procedure; Pressure Test Locations And Procedure; General Operation Information; Primary Mechanical Components - ATSG Chrysler 45RFE Service Manual

FLUID LEVEL CHECK PROCEDURE

(1) Transmission fluid level must be checked before
performing the pressure tests and must be at normal
operating temperature for accurate check.
vehicle if necessary to bring fluid temperature up to
normal operating temperature of 82°C (180°F).
(2) Position vehicle on flat level surface.
(3) Start and run engine at curb idle speed.
(4) Apply Parking Brakes.
(5) Shift transmission through all gear ranges and
then back to the Neutral position.
(6) Remove dipstick and check fluid level.
(A) Correct level is in crosshatch area.
(B) Correct maximum level is to MAX arrow.
(C) Incorrect level is at or below MIN line.
(7) If fluid level is low, add only enough of the
Mopar® ATF Plus 3, Type 7176 to restore correct
fluid level. Do not overfill (See Figure 26).
Dexron II fluid is NOT recommended.
chatter can result from the use of improper fluid.

PRESSURE TEST LOCATIONS AND PROCEDURE

There are only two pressure taps supplied on the
transmission case. The torque converter ON and
torque converter OFF taps are located on the right side
of the transmission case, shown in Figure 25.
There are two available methods to determine main
line pressure. The DRB Scan Tool can be used to read
main line pressure from the line pressure sensor. The
2nd method is to install Line Pressure Adapter 8259
into the transmission case, and re-install the line
pressure sensor and the pressure gauge into the
adapter, shown in Figure 25. This will allow a
comparison of the DRB readings and the pressure
gauge to determine the accuracy of the feedback to the
controller. Refer to the chart in Figure 25 for proper
pressure readings.
To access any of the other pressure tap locations, the
transmission oil pan must be removed, the pressure
taps removed from the valve body and the Valve Body
Pressure Tap Adapter 8258 installed. Refer to Figure
12 on Page 16. The extensions supplied with Adapter
8258 will allow the installation of pressure gauges to
the valve body to test individual clutch pack
pressures. Refer to Figure 12 on Page 16 for pressure
tap identification.
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Technical Service Information
Drive
Clutch
AUTOMATIC TRANSMISSION SERVICE GROUP

GENERAL OPERATION INFORMATION

The 45RFE transmission is a sophisticated, multi-
range, electronically controlled transmission which
combines optimized gear ratios for very responsive
performance and state of the art efficiency. Features
include driver adaptive shifting and three planetary
gear sets to provide wide ratio capability with precise
ratio steps to optimize driveability.
planetary gear sets also make available a unique
alternate 2nd gear ratio. The primary 2nd gear ratio
falls between 1st and 3rd gears for normal upshifts on
acceleration. The alternate 2nd gear ratio (2nd Prime)
allows for a smoother 4-2 kickdown at high speeds to
provide 2nd gear passing performance over a wider
hi-way crusing range.
The 45RFE offers full electronic control of all
automatic up and downshifts, and features real-time
adaptive closed-loop shift and pressure control.
Electronic shift and converter clutch controls help
protect the transmission from damage due to high
temperatures, which can occur under severe operating
conditions.
The 45RFE also features a unique dual stage oil
pump with electronic output pressure control. Under
most driving conditions, pump output pressure
greatly exceeds that which is needed to keep the
clutches applied. The 45RFE pump pressure control
system moniters input torque and adjusts the pump
pressure accordingly. The primary stage of the pump
works continuously. The second stage is by-passed
when demand is low.
moniters input and output speed and, if clutch
slippage is observed, the pressure control solenoid
duty cycle is varied, increasing pressure in proportion
to demand.

PRIMARY MECHANICAL COMPONENTS

3 MULTIPLE DISC INPUT CLUTCHES
3 MULTIPLE DISC HOLDING CLUTCHES
3 PLANETARY GEAR SETS
5 HYDRAULIC ACCUMULATORS
DUAL STAGE HYDRAULIC OIL PUMP
VALVE BODY
TRANSMISSION RANGE SENSOR/SOLENOID PACK
The three
The control system also
31