Fluid Passages. Buick Lucerne 2008

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2008 🢒 Lucerne 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T80-E 🢒 Fluid Passages

Figure 1:

Scavenge Pump Body Fluid Passages (Scavenge Pump Cover Side)


(1)	Left Scavenge Suction
(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(2)	Right Scavenge Suction
(3)	Scavenge Outlet
(3)	Scavenge Outlet
(3)	Scavenge Outlet
(3)	Scavenge Outlet
(56)	Void
(56)	Void

Figure 2:

Scavenge Pump Cover Fluid Passages (Scavenge Pump Body Side)


(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(3)	Scavenge Outlet
(56)	Void

Figure 3:

Scavenge Pump Cover Fluid Passages (Primary Pump Body Side)


(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(2)	Right Scavenge Suction
(3)	Scavenge Outlet
(3)	Scavenge Outlet
(3)	Scavenge Outlet
(4)	Main Pump Suction
(5)	Sump
(5)	Sump
(6)	Line
(6)	Line
(56)	Void
(56)	Void
(56)	Void

Figure 4:

Primary Pump Body Fluid Passages (Scavenge Pump Cover Side)


(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(3)	Scavenge Outlet
(4)	Main Pump Suction
(5)	Sump
(6)	Line
(56)	Void

Figure 5:

Primary Pump Body Fluid Passages (Secondary Pump Body Side)


(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(3)	Scavenge Outlet
(4)	Main Pump Suction
(5)	Sump
(6)	Line
(7)	Secondary line
(56)	Void

Figure 6:

Secondary Pump Body Fluid Passages (Primary Pump Body Side)


(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(3)	Scavenge Outlet
(4)	Main Pump Suction
(6)	Line
(7)	Secondary Line
(56)	Void
(216)	Secondary Pump Cut-Off Ball

Figure 7:

Secondary Pump Body Fluid Passages (Case Cover Side)


(216)	Secondary Pump Cut-Off Ball
(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(4)	Main Pump Suction
(6)	Line
(7)	Secondary Line
(8)	Converter Feed
(9)	Lube 2
(11)	Converter Release
(22)	Torque Signal
(32)	Reverse
(40)	3rd Clutch
(56)	Void

Figure 8:

Gasket Fluid Passages (Secondary Pump Body to Spacer Plate)


(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(4)	Main Pump Suction
(4)	Main Pump Suction
(6)	Line
(6)	Line
(6)	Line
(8)	Converter Feed
(8)	Converter Feed
(8)	Converter Feed
(9)	Lube 2
(11)	Converter Release
(11)	Converter Release
(11)	Converter Release
(22)	Torque Signal
(22)	Torque Signal
(22)	Torque Signal
(32)	Reverse
(40)	3rd Clutch
(40)	3rd Clutch
(56)	Void
(56)	Void
(56)	Void
(56)	Void
(56)	Void
(56)	Void
(56)	Void
(56)	Void
(56)	Void
(56)	Void

Figure 9:

Upper Control Valve Body Fluid Passages (Case Cover Side)


(6)	Line
(8)	Converter Feed
(10)	TCC Feed Limit
(10)	TCC Feed Limit
(10)	TCC Feed Limit
(11)	Converter Release
(12)	Converter Apply
(13)	TCC Exhaust Enable
(15)	To Cooler
(20)	Actuator Feed
(20)	Actuator Feed
(21)	Filtered Actuator Feed
(22)	Torque Signal
(22)	Torque Signal
(27)	Primary Accumulator
(27)	Primary Accumulator
(30)	Secondary 2-3 Accumulator
(31)	2-3 Accumulator
(31)	2-3 Accumulator
(40)	3rd Clutch
(40)	3rd Clutch
(40)	3rd Clutch
(41)	Filtered 3rd Clutch
(41)	Filtered 3rd Clutch
(45)	Regulated Apply
(45)	Regulated Apply
(45)	Regulated Apply
(46)	TCC Control
(46)	TCC Control
(52)	Exhaust
(52)	Exhaust
(56)	Void
(56)	Void
(56)	Void

Figure 10:

Gasket Fluid Passages (Upper Control Valve Body to Spacer Plate)


(6)	Line
(8)	Converter Feed
(10)	TCC Feed Limit
(11)	Converter Release
(12)	Converter Apply
(13)	TCC Exhaust Enable
(14)	Orifice TCC Exhaust Enable
(15)	To Cooler
(20)	Actuator Feed
(22)	Torque Signal
(27)	Primary Accumulator
(29)	1-2 Accumulator
(30)	Secondary 2-3 Accumulator
(31)	2-3 Accumulator
(40)	3rd Clutch
(41)	Filtered 3rd Clutch
(42)	Orificed 3rd Clutch
(45)	Regulated Apply
(46)	TCC Control

Figure 11:

Spacer Plate Fluid Passages (Secondary Pump Body and Upper Control Valve Body to Case Cover)


(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(4)	Main Pump Suction
(4)	Main Pump Suction
(9)	Lube 2
(10)	TCC Feed Limit
(11)	Converter Release
(12)	Converter Apply
(13)	TCC Exhaust Enable
(14)	Orifice TCC Exhaust Enable
(15)	To Cooler
(27)	Primary Accumulator
(30)	Secondary 2-3 Accumulator
(31)	2-3 Accumulator
(31)	2-3 Accumulator
(32)	Reverse
(41)	Filtered 3rd Clutch
(42)	Orificed 3rd Clutch
(45)	Regulated Apply
(46)	TCC Control

Figure 12:

Gasket Fluid Passages (Spacer Plate to Case Cover)


(1)	Left Scavenge Suction
(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(4)	Main Pump Suction
(4)	Main Pump Suction
(6)	Line
(6)	Line
(6)	Line
(6)	Line
(6)	Line
(6)	Line
(6)	Line
(6)	Line
(6)	Line
(6)	Line
(8)	Converter Feed
(8)	Converter Feed
(8)	Converter Feed
(8)	Converter Feed
(8)	Converter Feed
(8)	Converter Feed
(9)	Lube 2
(9)	Lube 2
(10)	TCC Feed Limit
(10)	TCC Feed Limit
(10)	TCC Feed Limit
(11)	Converter Release
(11)	Converter Release
(11)	Converter Release
(11)	Converter Release
(12)	Converter Apply
(13)	TCC Exhaust Enable
(13)	TCC Exhaust Enable
(13)	TCC Exhaust Enable
(15)	To Cooler
(20)	Actuator Feed
(20)	Actuator Feed
(22)	Torque Signal
(22)	Torque Signal
(22)	Torque Signal
(22)	Torque Signal
(22)	Torque Signal
(22)	Torque Signal
(27)	Primary Accumulator
(27)	Primary Accumulator
(30)	Secondary 2-3 Accumulator
(30)	Secondary 2-3 Accumulator
(30)	Secondary 2-3 Accumulator
(30)	Secondary 2-3 Accumulator
(31)	2-3 Accumulator
(31)	2-3 Accumulator
(32)	Reverse
(32)	Reverse
(40)	3rd Clutch
(40)	3rd Clutch
(40)	3rd Clutch
(40)	3rd Clutch
(40)	3rd Clutch
(40)	3rd Clutch
(41)	Filtered 3rd Clutch
(41)	Filtered 3rd Clutch
(42)	Orificed 3rd Clutch
(42)	Orificed 3rd Clutch
(45)	Regulated Apply
(45)	Regulated Apply
(45)	Regulated Apply
(45)	Regulated Apply
(45)	Regulated Apply
(46)	TCC Control
(46)	TCC Control
(46)	TCC Control

Figure 13:

Case Cover Fluid Passages (Secondary Pump Body and Upper Control Valve Body Side)


(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(4)	Main Pump Suction
(5)	Sump
(5)	Sump
(8)	Converter Feed
(9)	Lube 2
(10)	TCC Feed Limit
(11)	Converter Release
(11)	Converter Release
(12)	Converter Apply
(13)	TCC Exhaust Enable
(15)	To Cooler
(20)	Actuator Feed
(22)	Torque Signal
(30)	Secondary 2-3 Accumulator
(32)	Reverse
(40)	3rd Clutch
(41)	Filtered 3rd Clutch
(42)	Orificed 3rd Clutch
(45)	Regulated Apply
(46)	TCC Control
(55)	Overflow
(56)	Void
(56)	Void
(56)	Void

Figure 14:

Case Cover Fluid Passages (Case Side)


(1)	Left Scavenge Suction
(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(2)	Right Scavenge Suction
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(6)	Line
(9)	Lube 2
(9)	Lube 2
(15)	To Cooler
(20)	Actuator Feed
(20)	Actuator Feed
(27)	Primary Accumulator
(27)	Primary Accumulator
(32)	Reverse
(32)	Reverse
(33)	Reverse Clutch
(39)	2nd Clutch
(40)	3rd Clutch
(42)	Orificed 3rd Clutch
(54)	Drain
(55)	Overflow

Figure 15:

Seal Fluid Passages (Case Cover to Case and Driven Sprocket Support)


(1)	Left Scavenge Suction
(1)	Left Scavenge Suction
(1)	Left Scavenge Suction
(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(2)	Right Scavenge Suction
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(6)	Line
(6)	Line
(6)	Line
(6)	Line
(9)	Lube 2
(20)	Actuator Feed
(20)	Actuator Feed
(20)	Actuator Feed
(27)	Primary Accumulator
(27)	Primary Accumulator
(27)	Primary Accumulator
(32)	Reverse
(32)	Reverse
(32)	Reverse
(33)	Reverse Clutch
(33)	Reverse Clutch
(39)	2nd Clutch
(39)	2nd Clutch
(40)	3rd Clutch
(40)	3rd Clutch
(40)	3rd Clutch
(40)	3rd Clutch
(42)	Orificed 3rd Clutch
(43)	4th Band Feed
(54)	Drain
(55)	Void

Figure 16:

Case and Driven Sprocket Support Fluid Passages (Case Cover Side)


(1)	Left Scavenge Suction
(1)	Left Scavenge Suction
(1)	Left Scavenge Suction
(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(5)	Sump
(6)	Line
(6)	Line
(6)	Line
(9)	Lube 2
(9)	Lube 2
(16)	Lube
(20)	Actuator Feed
(20)	Actuator Feed
(20)	Actuator Feed
(27)	Primary Accumulator
(27)	Primary Accumulator
(27)	Primary Accumulator
(32)	Reverse
(32)	Reverse
(33)	Reverse Clutch
(33)	Reverse Clutch
(39)	2nd Clutch
(39)	2nd Clutch
(40)	3rd Clutch
(40)	3rd Clutch
(40)	3rd Clutch
(40)	3rd Clutch
(42)	Orificed 3rd Clutch
(52)	Exhaust
(54)	Drain
(55)	Overflow
(56)	Void

Figure 17:

Case Fluid Passages (Case Extension Side)


(2)	Right Scavenge Suction

Figure 18:

Case Fluid Passages (Lower Channel Plate Side)


(1)	Left Scavenge Suction
(2)	Right Scavenge Suction
(6)	Line
(20)	Actuator Feed
(27)	Primary Accumulator
(32)	Reverse
(33)	Reverse Clutch
(38)	Forward Clutch
(39)	2nd Clutch
(40)	3rd Clutch
(44)	4th Band
(49)	Coast Clutch
(56)	Void

Figure 19:

Transfer Plate Fluid Passages (Case Bottom Side)


(32)	Reverse
(32)	Reverse
(40)	3rd Clutch
(56)	Void
(56)	Void
(56)	Void

Figure 20:

Lower Channel Plate Fluid Passages (Case Bottom Side)


(6)	Line
(17)	PRN
(20)	Actuator Feed
(21)	Filtered Actuator Feed
(23)	Solenoid A
(24)	Solenoid B
(26)	Reverse Band
(27)	Primary Accumulator
(28)	3-4 Accumulator
(29)	1-2 Accumulator
(32)	Reverse
(33)	Reverse Clutch
(34)	Drive
(35)	Low Feed
(36)	Low
(37)	Low and Reverse Band Reduce
(38)	Forward Clutch
(39)	2nd Clutch
(40)	3rd Clutch
(43)	4th Band Feed
(44)	4th Band
(47)	D321
(48)	Coast Clutch Feed
(49)	Coast Clutch
(50)	D21
(51)	D21Y
(53)	Orificed Exhaust
(56)	Void

Figure 21:

Spacer Plate and Gasket Assembly Fluid Passages (Lower Control Valve Body to Channel Plate)


(1)	Metered Orifice
(6)	Line
(17)	PRN
(17)	PRN
(20)	Actuator Feed
(21)	Filtered Actuator Feed
(23)	Solenoid A
(24)	Solenoid B
(26)	Reverse Band
(32)	Reverse
(34)	Drive
(35)	Low Feed
(36)	Low
(38)	Forward Clutch
(39)	2nd Clutch
(39)	2nd Clutch
(40)	3rd Clutch
(43)	4th Band Feed
(44)	4th Band
(47)	D321
(48)	Coast Clutch Feed
(49)	Coast Clutch
(50)	D21
(51)	D21Y
(52)	Exhaust
(53)	Orificed Exhaust

Figure 22:

Lower Control Valve Body Fluid Passages (Lower Channel Plate Side)


(6)	Line
(17)	PRN
(18)	PRND4
(19)	PRND43
(20)	Actuator Feed
(21)	Filtered Actuator
(23)	Solenoid A
(24)	Solenoid B
(25)	Low and Reverse Band Apply
(26)	Reverse Band
(32)	Reverse
(34)	Drive
(35)	Low Feed
(36)	Low
(37)	Low and Reverse Band Reduce
(38)	Forward Clutch
(39)	2nd Clutch
(40)	3rd Clutch
(43)	4th Band Feed
(44)	4th Band
(47)	D321
(48)	Coast Clutch Feed
(49)	Coast Clutch
(50)	D21
(51)	D21Y
(52)	Exhaust
(56)	Void

Figure 23:

Accumulator Housing Fluid Passages (Lower Channel Plate Side)


(27)	Primary Accumulator
(28)	3-4 Accumulator
(29)	1-2 Accumulator
(33)	Reverse Clutch
(38)	Forward Clutch
(44)	4th Band
(56)	Void