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Automatic Transmission
System Description (cont'd)
Power Flow
POSITION
PART
POSITION
TORQUE
CONVERTER
1ST GEAR
1ST
CLUTCH
2ND GEAR
2ND
CLUTCH
3RD GEAR
3RD
CLUTCH
4TH
REVERSE
GEAR
PARK
GEAR
POSITION
TORQUE
CONVERTER
1ST GEAR
1ST
CLUTCH
2ND GEAR
2ND
CLUTCH
3RD GEAR
3RD
CLUTCH
GEAR
CLUTCH
REVERSE
GEAR
PARK
GEAR
B
o
X
X
X
X
X
X
m
o
X
X
X
X
O
O
X
m
o
X
X
X
X
X
X
X
B
1ST
o
O
X
X
X
X
X
X
B
2ND
o
X
O
X
X
X
X
X
B
3RD
o
X
X
O
X
X
X
X
B
4TH
o
X
X
X
O
X
X
B
1ST
o
O
X
<
X
X
X
X
B
2ND
o
X
O
X
X
X
X
X
B
3RD
o
X
X
O
X
X
X
X
HI
o
X
O
X
X
X
X
X
m
o
O
X
X
X
X
X
X
O : Operates
x : Doesn't operate
Gear Operation
Gears on the mainshaft:
• The 3rd gear is engaged/disengaged with the mainshaft by the 3rd clutch.
• The 4th gear is engaged/disengaged with the mainshaft by the 4th clutch.
• The reverse gear is engaged/disengaged with the mainshaft by the 4th clutch.
• The idler gear is splined with the mainshaft and rotates with the mainshaft.
Gears on the countershaft:
• The final drive gear is integral with the countershaft.
• The 1st gear, 3rd gear, 2nd gear, and park gear are splined with the countershaft and rotate with the countershaft.
• The 4th gear and reverse gear rotate freely from the countershaft. The reverse selector engages the 4th gear or the
reverse gear with the reverse selector hub. The reverse selector hub is splined with the countershaft so that the 4th
gear or reverse gear engage with the countershaft.
• The idler gear rotates freely from the countershaft.
Gears on the secondary shaft:
• The 1st gear is engaged/disengaged with the secondary shaft by the 1st clutch.
• The 2nd gear is engaged/disengaged with the secondary shaft by the 2nd clutch.
• T h e idler gear is splined with the secondary shaft and rotates with the secondary shaft.
14-22
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Troubleshooting
