Workshop Repair and Service Manuals GMC SIERRA
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Transmission Transaxle

Direct Clutch Housing Bushing Replacement Automatic Transmission Unit Automatic Clutches      Tools RequiredGE-8092 Driver HandleJ 43778 Clutch Bushing InstallerRemoval Procedure Important:DO NOT score the 1–2–3–4, 4–5–6 clutch housing bore when removing the clutch housingbushing. Gently tap the bushing through the...
Drain Oil Automatic      Rotate the transmission so that the converter housing is up.Allow the transmission fluid to drain from the caseextension.
Drive Range Fifth Gear Default Automatic      If the transmission is in 4th, 5th or 6th gear during atransmission electrical component failure, the transmission willdefault to 5th gear. All solenoids will default to their normalstate. If the torque converter clutch was...
Drive Range First Gear Automatic      As the vehicle speed increases, the transmission controlmodule-(TCM) receives input signals from the automatictransmission input and output speed sensors, throttle positionsensor and other vehicle sensors to determine the...
Drive Range First Gear Automatic      When the gear selector lever is moved to the OverdriveRange-(D) position from the Neutral-(N)position, after the first 1–2 shift has occurred, thefollowing changes occure to shift the transmission into OverdriveRange – First...
Drive Range - Fourth Gear Automatic      As vehicle speed increases, the TCM processes input signalsfrom the input and output speed sensors, the TP sensor and othervehicle sensors to determine the precise moment to command ON thenormally high pressure control...
Drive Range Second Gear Automatic      As vehicle speed increases and operating conditions becomeappropriate, the transmission control module-(TCM)processes input signals from the input and output speed sensors,the throttle position-(TP) sensor and other...
Drive Range Third Gear Default Automatic      If the transmission is in 1st, 2nd or 3rd gear during atransmission electrical component failure, the transmission willdefault to 3rd-gear. All solenoids will default to theirnormal state. If the torque converter clutch was...
Electronic Component Description Automatic      Control Solenoid (W/Body and TCM) Valve Assembly (1) Line Pressure Control (PC)Solenoid (2) Torque Converter Clutch (TCC)Pressure Control (PC) Solenoid (3) Shift Solenoid (SS) 2 (4) 16 Pin Connector (5)...
Electronic Component Description Automatic - part 3      Bothsolenoid types have an orifice, electrical windings, an iron core,and a steel check ball. Shift solenoids provide the necessary logic to distributefluid to the correct clutches. The shift solenoids provide eitherfull...
Electronic Component Description Automatic - part 2      This position iscommunicated to the TCM so that certain vehicle control functionscan be coordinated with the position of the shift controls. The IMShas redundant circuitry to alert the TCM in the event of a singlewire or switch...
Electronic Component Description Automatic      Transmission Control Module A microcomputer controls the transmission by receiving andprocessing signals from various switches and sensors. Themicrocomputer determines shift sequences, shift timing, and clutchapply and...
Electronic Component Description Automatic - part 4      EV Mode 2 As vehicle speed increases, the system shifts to EV Mode-2. EV Mode 2 uses a compoundsplit configuration to transfer power through the transmission during higher speedoperating conditions such as highway cruising....
Electronic Component Description Automatic - part 3      The sensor faces the hybrid direct, 2-3-4 clutch housing assemblymachined teeth surface. The sensor receives 8.3–9.3-volts on the OSS supply voltagecircuit from the transmission control module-(TCM). As the output shaft...
Electronic Component Description Automatic - part 2      Control Solenoid Valve Assembly (1) Pressure ControlSolenoid-2 (2) Pressure ControlSolenoid-4 (3) ShiftSolenoid-2 (4) 16 Pin Connector (5) Line Pressure ControlSolenoid (6) Transmission Fluid...
Electronic Component Description Automatic      Electronic Components (6) A/Trans Auxiliary Fluid PumpAssembly (31) A/Trans Manual Shift Shaft PositionSwitch Assembly (71) Drive Motor (w/Generator)Assembly-–-1st Position (88) Drive Motor...
Engine Flywheel Cleaning and Inspection Flywheel Flexplate      Important:In order to maintain the proper component balance, contactsurface taper, and heat transfer, manual transmission flywheels areNOT to be machined. Clean the flywheel assembly.Inspect the flywheel assembly for cracks...
Engine Flywheel Cleaning and Inspection Flywheel Flexplate      Note:In order to maintain the proper component balance, contactsurface taper and heat transfer, manual transmission flywheels areNOT to be machined. Warning:Refer toSafety Glasses Warning. Clean the engineflywheel-(1-or-2)...
Engine Flywheel Installation (Automatic Transmission) Flywheel Flexplate      Special ToolsJ 44643 Flywheel Hold ToolJ 45059 Angle Meter For equivalent regional tools, refer toSpecial Tools. Install the flywheel to the crankshaft.Install the flywheel washer to the flywheel with the beveled side...
Engine Flywheel Installation Flywheel Flexplate      Note:If replacing the engine flywheel, manual transmission, notethe position and length of the original flywheel weights, ifapplicable. Flywheel weights of the same length must be installedinto the new engine flywheel in...
Engine Flywheel Installation Flywheel Flexplate      Note: For manual transmission applications, note the position and direction of the engineflywheel before removal. Mark or scribe the end of the crankshaft and flywheel beforecomponent removal. The existing manual...
Engine Flywheel Removal (Automatic Transmission) Flywheel Flexplate      Special Tools J 44643Flywheel Hold Tool For equivalent regional tools, refer toSpecial Tools. Remove the flywheel mounting bolts and discard.Remove the flywheel washer.Remove theJ 44643tool.Remove the flywheel assembly.
Engine Flywheel Removal Flywheel Flexplate      Important:For manual transmission applications, note the position anddirection of the engine flywheel before removal. The flywheel doesnot use a locating pin for alignment. Mark or scribe the end of thecrankshaft and the...
Engine Flywheel Removal Flywheel Flexplate      Remove the engine flywheel bolts.Remove the engine flywheel-(1), automatictransmission, if applicable.Remove the engine flywheel-(2), manualtransmission, if applicable. Important:If replacing the engine flywheel, manual...