AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
4
Copyright © 2003 ATSG
TRANSMISSION
DESCRIPTION AND OPERATION
General Description
Shift Quadrant Indicator
Major Internal Components
"Seven Friction Apply Elements"
"Three One-Way Clutches"
"Three Simple Planetary Gearsets"
"Typical" Shift Quadrant Indicator
The Ford 4R100 automatic transmission is a four
forward speed unit with electronic shift control. It is
designed for longitudinal powertrains for rear wheel
drive vehicles.
The 4R100 transmission features a four element
torque converter design that includes Torque
Converter Clutch (TCC) and a gear train that includes
three planetary gearsets.
Some
models provide for Power Take Off (PTO)
operation in all transmission shift lever positions.
During PTO operation in OD, 4th gear is disabled.
The hydraulic control system of the 4R100 unit has
five electronically controlled solenoids for:
Shift feel, through line pressure control.
Shift scheduling, through shift valve position.
Engine braking during coast conditions.
TCC apply (On/Off or Modulating).
Intermediate Band
Coast Clutch, Multi-disc
Overdrive Clutch, Multi-disc
Intermediate Clutch, Multi-disc
Direct Clutch, Multi-disc
Forward Clutch, Multi-disc
Low/Reverse Clutch, Multi-disc
Overdrive Roller Clutch
Intermediate Sprag
Low Roller Clutch
Overdrive
Forward
Reverse
P R N D 2 1
Figure 2
Figure 3
Vehicles equipped with the 4R100 transmission have
a Transmission Control Switch (TCS), also referred to
as "Overdrive Cancel Switch", and a Transmission
Control Indicator Lamp (TCIL), located on the end of
the manual gear shift lever, as shown in Figure 3. The
TCS is a momentary contact switch. When this
switch is pressed, a signal is sent to the PCM to allow
automatic shifts from 1st to 4th gear or from 1st to 3rd
gear. After the TCS has been pressed the PCM turns
on the TCIL lamp ("OFF"), to indicate that overdrive
has been canceled, as shown in Figure 3.
OVERDRIVE OFF
OVERDRIVE OFF
TCS
SWITCH
TCIL LAMP
The shift quadrant has the following positions, as
shown in Figure 2:
P, R, N, D , 2
and
1
.
D
position (TCS OFF) provides 1-2-3-4 automatic
upshifts and downshifts. Coast braking occurs in 4th
gear. (TCIL Not Illuminated)
D
position (TCS ON) provides 1-2-3 automatic
upshifts and downshifts. Coast braking occurs in 3rd
gear. (TCIL Illuminated)
2
position provides a pull-in shift to 3rd gear with
coast braking. After an automatic downshift, a 2nd
gear hold occurs with coast braking.
1
position provides a pull-in shift to 2nd gear with
coast braking. After an automatic downshift, a 1st
gear hold occurs with coast braking.
Summary of Contents for FORD 4R100
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Page 119: ...AUTOMATIC TRANSMISSION SERVICE GROUP Technical Service Information 119 Copyright 2003 ATSG...
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