Content .. 1974 1975 1976 1977 ..

Chrysler 300/300 Touring/300C, Dodge Magnum. Manual - part 1976

NOTE: During the test, apply a contact force by
hand to K3 in the direction of the arrow.

8. Inspect axial play between shim (10) and retaining

ring (11). Check axial play

between shim (10)

and retaining ring (1) using a feeler gauge. Clear-
ance should be 0.15-0.6 mm (0.006-0.024 in.).
Shims are available in thicknesses of 3.0 mm
(0.118 in.), 3.4 mm (0.134 in.), and 3.7 mm (0.146
in.). Adjust as necessary

1 - DRIVING CLUTCH K3
2 - THRUST WASHER
3 - SHIM
4 - AXIAL NEEDLE BEARING
5 - RETAINING RING
6 - OUTPUT SHAFT WITH CENTER PLANETARY CARRIER

21 - 438

AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION

MECHANISM-SHIFT

DESCRIPTION

The automatic transmission is operated with the help
of a shift lever assembly (SLA) (1) located in the floor
console. There are four positions to which the selec-
tion lever can be shifted: P, R, N, D. In addition, the
selector lever can be moved sideways (+/-) in position

to adjust the shift range.

All selector lever positions, as well as selected shift
ranges in position

, are identified by the SLA. The

information is then sent to the transmission control
module (TCM) via a hardwire connection. At the same
time, the selector lever positions

and

are transmitted by a shift cable to the selector shaft in
the transmission.

The SLA is comprised of the following functions:

•

Key lock: Depending on the selector lever position, the ignition cylinder is locked/unlocked, i.e., the ignition
key can be removed only if the selector lever is in position

. A park lock cable is used to perform this

function.

•

Park lock: The selector lever is not released from postion

until the brake pedal has been applied and the

ignition key is in ”ACC” or ON” positions. Shift lock is controlled by the brake light switch in conjunction with a
locking solenoid in the SLA. As soon as the brake pedal is applied firmly, the locking solenoid is energized and
retracted to unlock the selector lever. If the selector lever cannot be moved out of position

due to a mal-

function, the shift lock function can be overriden (2). (Refer to 21 - TRANSMISSION/AUTOMATIC TRANSMIS-
SION - NAG1/SHIFT INTERLOCK MECHANISM - OPERATION)

•

Reverse inhibitor: As soon as the vehicle speed exceeds approximately 4-7 mph, it is no longer possible to
move the selector lever from position

to position

. The reverse inhibit functionality is controlled by the

same solenoid as the park lock. As the vehicle accelerates past the calibrated speed threshold, the solenoid is
energized to block the sideways motion of the shift lever necessary to move from NEUTRAL to REVERSE.
The reverse inhibit is not released until the vehicle speed falls below approximately 4-7 mph and the shifter is
moved out of the “D” shifter position.

OPERATION

With the selector lever in position

, the transmission control module (TCM) automatically shifts the gears that are

best-suited to the current operating situation. This means that shifting of gears is continuously adjusted to current
driving and operating conditions in line with the selected shift range and the accelerator pedal position. Starting off
is always performed in 1st gear.

The selector lever positions are determined by a sensor assembly internal to the shift lever assembly (SLA). The
sensor assembly identifies the various positions of the SLA according to the following table.

AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION

21 - 439

Shift Lever

Position

Bit 0

Bit 1

Bit 2

Bit 3

Default

Implausible

The current selector lever position or, if the shift range has been limited, the current shift range is indicated in the
instrument cluster display.

The permissible shifter positions and transmission operating ranges are:

•

P = Parking lock and engine starting.

•

R = Reverse.

•

N = Neutral and engine starting (no power is transmitted to the axles).

•

D = The shift range includes all forward gears.

The shift range can be adjusted to the current operating conditions by tipping the selector lever to the left-hand side
(

) or the right-hand side (

) when in position

. If the shift range is limited, the display in the instrument cluster

indicates the selected shift range and not the currently engaged gear.

•

4= Shift range is limited to gears 1 to 4.

•

3= Shift range is limited to gears 1 to 3.

•

2= Shift range is limited to gears 1 to 2.

•

1= Shift range is limited to the 1st gear.

Tipping the shift lever will have the following results:

•

Tipping the selector lever toward

(

one time after another: The shift range is reduced in descending

sequence by one gear each time, i.e., from D - 4 - 3 - 2 - 1. If the selected limitation of the shift range would
result in a downshift causing excessive engine speed, the shifting is not executed and the engaged gear as
well as the shift range remain unchanged. This is to prevent the engine from overspeeding. Engine retardation
is low with the selector lever in position

. To make use of the full braking power of the engine,

manual

downshifting by tipping the lever towards the left-hand side is recommended. If this has been done, subse-
quent upshifting must be carried out manually as well.

•

Tipping the selector lever toward

(

and holding it in this position: The currently engaged gear in range

is indicated in the instrument cluster display and the shift range is limited to this gear.

•

Tipping the selector lever toward

(

one time after another: The shift range is increased by one gear each

time and the increased shift range is displayed in the instrument cluster; possibly, the transmission upshifts to
a faster gear.

•

Tipping the selector lever toward

(

several times: The shift range is increased by one gear each time the

lever is tipped until the shift range ends up in

•

Tipping the selector lever toward

(

and holding it in this position: The shift range is extended immedi-

ately to

, shift ranges are indicated in ascending sequence; possibly, the transmission upshifts to a faster

gear due to the extension of the shift range.

21 - 440

AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION

REMOVAL

1. Remove any necessary console parts for access to

shift lever assembly and shifter cables. (Refer to 23
-

BODY/INTERIOR/FLOOR

CONSOLE

REMOVAL)

2. If necessary, remove the bolts holding the shield,

covering the gearshift and park lock cables, to the
floorpan and remove the shield.

3. Shift transmission into PARK.

4. Disconnect the transmission shift cable (1) at shift

lever (3) and shifter assembly bracket (2).

5. Remove the shift cable retainer (2) from the notch

in the shifter assembly (2).

6. Verify the key is in the LOCK position and discon-

nect the park lock cable (1) from the shifter
mechansim cam (3) and the notch in the shifter
assembly (3).

AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION

21 - 441

Content .. 1974 1975 1976 1977 ..