GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2001 🢒 Catera 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L30-E 🢒 Disassembled Views
Figure 1:

Case and Associated Parts (1 of 2)
Object Number: 377429 Size: LF
(1)Torque Converter
(2)Converter to Pump Seal Screw
(3) Converter Housing Seal Ring Assembly
(4)Converter Housing/Main Case Screw
(5)Converter Housing/Oil Pump Screw
(6)Converter Housing
(7)Converter Housing Plug
(8)Oil Pump to Converter Housing Seal
(8)Oil Pump to Converter Housing Seal
(9)Oil Pump Body Wear Plate
(10)Oil Pump Assembly
(11)Oil Pump to Adapter Case Gasket
(12)Selective Thrust Washer
(13) 3-4 Accumulator Piston Cover Retainer Ring
(14)3-4 Accumulator Piston Cover
(15)Selective Thrust Washer
(16)3-4 Accumulator Piston Spring
(17)3-4 Accumulator Piston Pin
(18)3-4 Accumulator Piston
(19)3-4 Accumulator Piston Ring
(20)Adapter Case
(22)Electrical/Adapter Case Connector
(23)Oil Pan Screw
(27)Oil Restrictor
(28)Center Support Spacer Plate Gasket
(28)Center Support Spacer Plate Gasket
(29)Adapter/Center Support Spacer Plate
(30)Center Support Assembly
(31)Center Support Screw
(32)Oil Seal
(67)Adapter Case Oil Pan
(68)Adapter Case Oil Pan Gasket
(69)Adapter Case Harness Assembly
(71)Adapter Case Control Valve Assembly
(72)Adapter Case Control Valve Gasket Assembly
(73)Adapter Spacer Plate
(85)Ball Check Valve
(104)Adapter Case/Spacer Plate Gasket
(105)Transmission Control Module (TCM)
(109)Adapter Case Control Valve Assembly Screw
Figure 2:

Case and Associated Parts (2 of 2)
Object Number: 178675 Size: LF
(23)Oil Pan Screw
(33)Main Case to Adapter Case Seal
(34)Cooler Fitting (Outlet)
(35)Cooler Fitting (Inlet)
(36)Main Case
(37)Breather Pipe
(38)Breather Pipe Seal
(39)Reservoir
(42)Extension Case Gasket
(43)Extension Assembly
(44)Speed Sensor Seal
(45)Speed Sensor Assembly
(46)Speed Sensor Screw
(47)Output Shaft/Drive Flange Nut
(48)Drive Flange Seal
(49)Drive Flange
(50)Extension Assembly Seal
(51)Needle/Extension Bearing
(52)Extension Screw
(53)Parking Lock Pawl Spring
(54)Parking Lock Pawl
(55)Electrical/Main Case Connector
(56)Parking Lock Actuator Assembly
(57)Manual Shaft Nut
(58)Manual Valve Link
(59)Spring Pin
(60)Detent Lever
(61)Manual Shaft
(62)Manual Shaft Seal
(63)Mode Switch Assembly
(64)Mode Switch Screw
(65)Mode Switch Shield
(70)Main Case Control Valve Body Assembly Screw
(70)Main Case Control Valve Body Assembly Screw
(70)Main Case Control Valve Body Assembly Screw
(74)Main Case Oil Pan
(75)Oil Pan/Main Case Gasket
(78)Chip Collector Magnet
(79)Oil Filter
(80)Main Case Harness Assembly
(82)Manual Detent Roller and Spring Assembly
(84)Main Case Control Valve Assembly
(85)Ball Check Valve
(85)Ball Check Valve
(86)Main V.B./Spacer Plate Gasket
(87)Main V.B./Spacer Plate
(88)Spacer/Main Case Gasket
(89)Spacer Plate on V.B. Screw
(90)Servo Cover Screw
(91)Servo Piston Cover
(92)Servo Piston Cover Gasket
(93)Servo Piston Retaining Ring
(94)Servo Piston Clip
(95)Servo Screw Nut
(96)Servo Piston Screw
(97)Servo Piston
(98)Servo Piston Seal
(99)Servo Piston Cushion Spring
(100)Cushion Spring Seat
(101)Servo Piston Adjusting Sleeve
(102)Servo Piston Apply Rod
(103)Servo Piston Return Spring
(106)Servo Piston Assembly
(108)Fill Plug
(110)Electrical Connector Seal
(111)Bracket
(112)Bracket
(113)Fill Plug Seal
Figure 3:

Oil Pump Assembly
Object Number: 178677 Size: MF
(201)Oil Pump Drive Gear
(202)Oil Pump Driven Gear
(203)Boost Valve Sleeve Pin
(204)Boost Valve Sleeve
(205)Boost Valve
(206)Pressure Regulator Valve Spring Seat
(206)Pressure Regulator Valve Spring Seat
(207)Pressure Regulator Valve Spring
(208)Pressure Regulator Valve
(209)Oil Pump Body
(210)Converter Clutch Control Valve
(211)Converter Clutch Control Valve Spring
(212)Converter Clutch Control Valve Plug
(213)Spring Pin
(214)Throttle Signal Accumulator Piston
(215)Throttle Signal Accumulator Spring
(216)Throttle Signal Accumulator Spring Seat
(217)Throttle Signal Accumulator Retainer Ring
Figure 4:

Adapter Valve Body Assembly
Object Number: 178678 Size: MF
(85)Ball Check Valve
(401)Adapter Case Valve Body
(402)Solenoid Screw
(402)Solenoid Screw
(403)Pressure Control Solenoid Retainer
(404)Pressure Control Solenoid
(405)3-4 Accumulator Plug
(407)3-4 Accumulator Valve
(408)3-4 Accumulator Valve Spring (Optional)
(409)3-4 Accumulator Control Valve
(410)Feed Limit Valve Spring
(411)Spring Seat
(412)Feed Limit Valve
(413)Filter Plug Seal
(414)Screen Plug
(415)Pressure Control Solenoid Screen Assembly
(416)Torque Converter Clutch On/Off N.C. Solenoid
(418)Plug and Spring Retainer
(419)Retainer
Figure 5:

Main Case Valve Body Assembly
Object Number: 178679 Size: MF
(85)Ball Check Valve
(301)Main Case Valve Body
(302)Spring Pin
(302)Spring Pin
(303)On/Off N.C. Solenoid Assembly
(304)1-2 and 3-4 Shift Valve
(305)1-2 and 3-4 Shift Valve Spring
(305)1-2 and 3-4 Shift Valve Spring
(306) Valve Retainer
(307)On/Off N.O. Solenoid Assembly
(308)2-3 Shift Valve
(309)Spring Pin
(309)Spring Pin
(310)Valve Bore Plug
(310)Valve Bore Plug
(311)Low Pressure Control Valve Spring
(312)Low Pressure Control Valve
(317)Ball, Plug
(317)Ball Plug
(318)1-2 Accumulator Control Valve
(319)1-2 Accumulator Control Spring (Optional)
(320)1-2 Accumulator Valve
(321)PWM Solenoid Waved Washer
(322)PWM Solenoid Pin
(323)PWM Band Control Solenoid Assembly,
(324)PWM Solenoid Screen Assembly
(325)Screen Plug
(326)Manual Valve
Figure 6:

Overdrive Internal Components
Object Number: 377980 Size: LF
(501)4th Clutch Retainer
(502)4th Clutch (Steel) Plate
(503)4th Clutch (Lined) Plate Assembly
(504)Ball Check Valve & Retainer Assembly
(505)Turbine Shaft Seal
(506)Turbine Shaft
(508)Turbine Shaft Oil Seal Ring (Scarf Cut)
(510)Overrun Clutch Housing
(513)Overrun Clutch Piston and Seal Assembly
(514)Overrun Clutch Release Spring
(515)Overrun Clutch Release Spring Retainer
(516)Overdrive Clutch Roller Assembly
(517)Overdrive Roller Clutch Cam
(518)Overrun Clutch Hub Retainer Ring
(519)Overdrive Sun Gear
(520)Overrun Clutch Cushion Plate
(521)Overrun Clutch (Steel) Plate
(522)Overrun Clutch (Lined) Plate Assembly
(523)Overrun Clutch Backing Plate
(524)Overrun Clutch Housing Retainer Ring
(525)Overdrive Carrier Assembly
(526)Turbine Shaft Overdrive Carrier Retainer Ring
(527)Thrust Bearing Assembly
(528)Overdrive Internal Gear
(529)Internal Gear Thrust Washer
(530)4th Clutch Spring Retainer Adapter Ring
(531)4th Clutch Retainer and Spring Assembly
(532)4th Clutch Piston
(533)4th Clutch Piston (Inner) Seal
(534)4th Clutch Piston (Outer) Seal
(535)Turbine Shaft Oil Seal Ring (Solid)
Figure 7:

Internal Components (1 of 2)
Object Number: 178683 Size: MF
(608)Reverse Clutch Piston (Inner) Seal
(609)Reverse Clutch Piston (Outer) Seal
(610)Reverse Clutch Piston
(611)Piston Clutch Spring
(611)Piston Clutch Spring
(612)Reverse Clutch Spring Seat
(613)Retaining Ring
(613)Retaining Ring
(614)Reverse Clutch Cushion Plate
(615)Reverse Clutch (Steel) Plate
(616)Reverse Clutch (Lined) Plate Assembly
(617)Reverse Clutch Pressure/Selective Plate
(618)2nd Clutch Drum Assembly
(620)2nd Clutch Piston (Inner) Seal
(621)2nd Clutch Piston (Outer) Seal
(622)2nd Clutch Piston
(623)2nd Clutch Spring Seat
(625)2nd Clutch Cushion Plate
(626)2nd Clutch (Steel) Plate
(627)2nd Clutch (Lined) Plate Assembly
(628)2nd Clutch Spacer
(629)Retaining Ring
(629)Retaining Ring
(630)Ring Gear
Figure 8:

Internal Components (2 of 2)
Object Number: 178685 Size: MF
(611)Piston Clutch Spring
(631)2nd/3rd Clutch Thrust Washer
(632)Clutch Hub Thrust Washer
(634)3rd Clutch Drum Assembly
(635)3rd Clutch Piston (Inner) Seal
(636)Retaining Washer
(637)3rd Clutch Piston (Outer) Seal
(638)3rd Clutch Piston
(639)3rd Clutch Spring Seat
(640)Retaining Ring
(641)3rd Clutch Cushion Plate
(642)Third Clutch (Steel) Plate
(643)3rd Clutch (Lined) Plate Assembly
(644)Input Sun Gear Thrust Washer
(645)Input Shaft/Sun Gear Bearing Assembly
(646)Input Sun Gear Assembly
(647)Sprag Race Assembly
(648)Sprag Retaining Ring
(649)Retaining Ring
(649)Retaining Ring
(650)Sprag Cage Assembly
(651)Output Shaft/Input Sun Gear Bearing
(652)Output Shaft/Input Sun Gear Washer
(653)Planetary Carrier Assembly
(658)Reaction Sun Gear
(659)Reaction Sun Drum
(664)Brake Band Assembly
(667)Parking Lock Wheel Seal
(668)Parking Lock Wheel
(672)Speedometer Wheel
(674)3rd Clutch (Lined) Plate Assembly
(675)Thrust Bearing Assembly
Figure 9:

Center Support Assembly
Object Number: 178686 Size: MF
(701)Center Support
(702)Retainer Plate
(702)Retainer Plate
(703)Overrun Lockout Valve Plug
(703)Overrun Lockout Valve Plug
(704)Overrun Lockout Spring
(705)Overrun Lockout Valve
(706)Reverse Lockout Control Valve
(707)Reverse Lockout Spring