Workshop Repair and Service Manuals GMC SIERRA
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Transmission Transaxle

Transmission General Description Automatic Transmission Unit      Allison 1000 Series transmissions are torque converterdriven, fully automatic, transmission systems. The 1000 Seriestransmissions have 6-forward speeds, NEUTRAL, andREVERSE. The fifth and sixth range has overdrive gear ratio....
Transmission Component and System Description Automatic Transmission Unit      The mechanical components of the 6-Speed RWD are asfollows: A torque converter with an electronically controlled capacityclutch-(ECCC). ECCC was developed to reduce thepossibility of noise, vibration, or chuggle caused by TCC...
Transmission Component and System Description Automatic Transmission Unit      The mechanical components of the 4L60-E are asfollows: A torque converter with an electronically controlled capacityclutch-(ECCC) This transmission is equipped with an ECCC. The pressureplate does not fully lock to the torque...
Disassembled Views Manual      Figure 1: Transmission Case and Related Components Figure 2: Main Shaft and Components Figure 3: Input Shaft and Components Figure 4: Counter Gear Shaft and Components Figure 5: Shift Control and...
Clutch Backing Plate Retaining Ring Specifications Automatic      Table 1: 3–5 Reverse Clutch Table 2: 1–2–3–4 Clutch Table 3: 4–5–6 Clutch Table 4: Low/Reverse Clutch 3–5 Reverse Clutch Clutch Pack Travel Specification –1.21–1.79-mm(0.048–0.070-in) Retaining Ring...
Hydraulic Clutch System Bleeding Manual Clutch      Caution:DO NOT use fluid which has been bled from a hydraulic clutchsystem, in order to fill the clutch master cylinder reservoir, dueto the possibility that the fluid may be aerated, have too muchmoisture content, or be...
Tow Haul Mode Description and Operation Automatic      Tow/haul mode is a function within the vehicle'ssoftware/calibration that optimizes transmission gear selection foroperation during towing or with heavy loads. This optimizationincludes improving acceleration performance...
Reset Transmission Adapts Automatic Transmission Unit      Reset Transmission Adapts is a procedure for automatictransmissions in which a series of tests are run to allow thetransmission control module-(TCM) to learn individualclutch characteristics. Once the clutch data is learned,...
Shift Speed (1-2 and 2-3 Shifts) Automatic      Shift Speed - 1–2 Shift Output Shaft RPM 2–3 Shift Output Shaft RPM Engine % of TPS 12 25 50 100 12 25 50 100 Mode - - LML 6.6L Normal 425 450 722 N/A* 867 867 1199 N/A*...
Transmission Adaptive Functions Automatic Transmission Unit      The Hydra-Matic® 6–Speed RWD transmissionutilizes a line pressure control system during upshifts tocompensate for the normal wear of transmission components. As theapply components within the transmission wear or change over...
Fluid Passages Automatic      Figure 1: Torque Dampener Housing Assembly Figure 2: Fluid Pump Cover Assembly - Torque Dampener Housing Assembly Side Figure 3: Fluid Pump Cover Assembly - Case Assembly Side Figure 4: Case Assembly -...
Fluid Capacity Specifications Automatic      Application Specification Metric English Drain Plug Only– Approximate Capacity 9.93-liters 10.5-quarts Drop Pan and Filter– Approximate Capacity 10.88-liters 11.5-quarts Dry Transmission...
Shift Speed (3-4 4-5 5-6 and CT Downshifts) Automatic      Shift Speed - 3–4 Shift Output Shaft RPM 4–5 Shift Output Shaft RPM 5–6 Shift Output Shaft RPM Closed Throttle Downshift Output Shaft RPM - - - - 6–5 5–4 4–3 3–2 2–1 Engine % of TPS 12 25 50 12 25 50...
Fastener Tightening Specifications (Off Vehicle) Automatic      Fastener Tightening Specifications Application Ref No. * Quantity Size Specification Metric English A/Trans Auxiliary Fluid PumpBolt-–-to Torque DampenerHousing 5 4 M6-x-1.0-x-65 9–13-Y...
Shift Solenoid Valve State and Gear Ratio Automatic Transmission Unit Transmission Shift Solenoids      Shift Solenoid Valve State and Gear Ratio Gear Shift SOL 1 Shift SOL 2 1–2–3–4 CL PC SOL 5 N.L. 2–6 CL PC SOL 4 N.L. 3–5 REV CL PC SOL 2 N.H. LOW REV 4–5–6 CL PC SOL 3 N.H. 6L45 6L50 Gear Ratio 6L80 6L90 Gear Ratio...
Definitions and Abbreviations Automatic      Throttle PositionsEngine Braking A condition where the engine is used to slow the vehicle bymanually downshifting during a zero throttle coastdown. Full Throttle Detent Downshift A quick apply of the accelerator pedal to its...
Definitions and Abbreviations Automatic - part 2      Tie-Up A condition where two opposing clutch and/or bands areattempting to apply at the same time causing the engine to laborwith a noticeable loss of engine RPM. Noise ConditionsDrive Link Noise A whine or growl that increases...
Bushing and Mating Shaft Inspection Automatic      Note:Proper bushing and corresponding mating shaft inspectionshould be performed before replacing the bushing, shaft, and insome cases, the component which houses the bushing. Thoroughlyclean and dry the bushing and shaft...
Range Reference Automatic      Range Reference Table Range Park Reverse Neutral Drive 1st Braking 1st 2nd 3rd 4th 5th 6th 1–2–3–4 Clutch — — — Applied Applied Applied Applied Applied — — 3–5 Reverse...
Transmission Mount Inspection Transmission Mounts      Caution:In order to avoid oil pan damage and possible engine failure,insert a block of wood that spans the width of the oil pan bottombetween the oil pan and the jack support. Raise the transmission/transaxle in order to...
Fastener Tightening Specifications - 4WD Driveline Control Manual      Fastener Tightening Specifications Application Specification Metric English Backup Lamp Switch 16–22-Y 12–16-lb-ft Breather Support Screw 13–18-Y 10–14-lb-ft Clutch Actuator Bolts 8-Y...
Case Porosity Repair Automatic      Some external leaks are caused by case porosity innon-pressurized areas. You can usually repair these leaks with thetransmission in the vehicle. Thoroughly clean the area to be repaired with a cleaningsolvent. Air dry the...
Torque Converter Housing Low and Reverse Clutch Housing Bolt Size Caution Automatic Torque Converter      Caution:The bolts used to install the torque converter housing andthe low and reverse clutch housing to the transmission case aresimilar in size and color. The low and reverse clutch housing boltsare, however, shorter than the...
Transmission Fluid Pressure Switch Logic Automatic      Transmission Fluid Pressure (TFP) Switch Logic Gear TFP Switch States TFP SW1 *TFP SW3 TFP SW4 TFP SW5 Park High Low Low Low Reverse Low Low Low Low Neutral High Low Low...