Transmission internal parts

2. Major Components
 Torque Converter
 Hydraulic link between
engine and transmission
 What to look for
 Bluing
 Damaged hub lands
 Stripped converter
studs/nuts
 Leaks

3. Major Components
 Transmission Case
 Houses internal parts
 What to look for
 Cracks
 Stripped threads
 Signs of leaking at
abnormal places (not
seal points, fittings)

4. Major Components
 Front Pump
 Creates hydraulic
pressure for
transmission
 Circulates fluid for
cooling and lubrication
 What to look for
 Damaged pump rotor,
vanes, wear in “pocket”

5. Major Components
 Valve Body
 Directs fluid to
clutches, bands,
converter clutch
 What to look for
 Valve body must be
disassembled to inspect
valves, springs, check
balls
 Load test solenoids

6. Shift Valves
 Governor
 Changes hydraulic
pressure based on
vehicle speed

7. Shift Valves
 Throttle Valve
 Changes hydraulic
pressure based on
load/throttle angle
 Will have a cable
attached to link

8. Major
Components
 Clutch Drum
 Houses Plates
 Clutch Piston
 Uses hydraulic pressure to
apply clutch plates
 Clutch Plates
 Friction
 Steel
 Turning clutch
 Housed inside drum and lets
a component turn
 Holding Clutch
 Splined to case and “holds” a
component

9. Major Components
 Clutch Packs
 Holds or Drives
different components of
planetary gear
 What to look for
 Burnt/Black Frictions or
blued steel
 Bands
 Holds a planetary
component

10. Major Components
Sprag type
One Way Clutch
Roller type
One Way Clutch

11. Major Components
 Planetary Gears
 Provides different gear
ratios
 What to look for
 Teeth chipped
 Play in gears
 Bad thrust washers

12. Electronic Components
EPC Solenoid
 Electronic Pressure Control
 Regulates pressure like
Governor and TV did
 Shift Solenoid
 Supplies ATF to shift valves
for shift control

13. Electronic Components
 OSS
 Output Shaft Speed
Sensor
 Tells PCM drive shaft
speed
 ISS
 Input Shaft Speed
Sensor
 Tells PCM Input speed
 BOO
 Brake On/Off
 Tells ECM if brakes are
applied