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Any of the following bushing conditions require replacement of the bushing and/or housing: Discoloration due to heat distress Misalignment or displacement of bushing as a result of spinning in housing Medium to heavy scoring that can be easily detected with fingernail. Light scoring is a Debris embedded into the bushing lining material Obvious damage, including excessive and uneven wear Excessive polishing. Minor polishing of the bushing is an indication of normal wear and Any of the following conditions require replacement of the bushing's mating shaft: Discoloration due to heat distress Rough surface finish that can be easily detected with finger Obvious shaft abnormalities, including warping or uneven surfaces Obvious damage or cracking TRANSMISSION OVERHEATS Transmission Overheats OIL PRESSURE HIGH OR LOW Checks Causes TCC Circuit Blockage during apply or release Pump Cover (215) Cross channel leakage Pressure Regulator Valve The valve is stuck in a high demand position Oil Cooler The cooler or the cooler lines are blocked Oil Pan Gasket (73) The gasket is damaged Turbine Shaft O-ring (618) The O-ring is damaged The seals are damaged Stator Shaft Bushings The bushing is worn or damaged Fluid The fluid level is low Radiator Air flow is restricted or internal blockage
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Oil Pressure High or Low Checks Causes ECM Torque Related DTCs DTCs can cause the engine torque value used by the TCM to Oil Pump Assembly (4) Pressure regulator valve stuck Pressure regulator valve spring Rotor guide omitted or misassembled Rotor cracked or broken Reverse boost valve or sleeve stuck, damaged or Orifice hole in pressure regulator valve plugged Sticking slide or excessive rotor clearance Pressure relief ball not seated or damaged Porosity in pump cover or body Wrong pump cover Pump faces not flat Excessive rotor clearance Oil Filter (72) Intake pipe restricted by casting flash Cracks in filter body or intake pipe O-ring seal missing, cut or damaged Wrong grease used on rebuild Control Valve Body (60) Manual valve scored or damaged Spacer plate or gaskets incorrect, misassembled or Face not flat 2-3 Shift valve stuck Checkballs omitted or misassembled Pressure Control Solenoid Damage to electrical terminals Transmission Fluid Pressure Contamination Damaged seals
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
HARSH SHIFTS Harsh Shifts INACCURATE SHIFT POINTS Inaccurate Shift Points Case (103) Case to control valve body face not flat System Voltage 12 volts not supplied to transmission Electrical short (pinched solenoid wire) Solenoid not grounded Checks Causes Throttle Position Sensor Open or shorted circuit Vehicle Speed Sensor (36) Open or shorted circuit Automatic Transmission Contamination Damaged seals Trans Fluid Temperature Open or shorted circuit Engine Coolant Temperature Open or shorted circuit Pressure Control Solenoid Damage to electrical terminals Contamination Checks Causes Oil Pump Assembly (4) Stuck pressure regulator valve Sticking pump slide Valve Body Assembly (60) Spacer plate or gaskets misassembled, damaged or incorrect Porous or damaged valve body pad 2-4 Servo Assembly 2-4 accumulator porosity Damaged servo piston seals Apply pin damaged or improper length 2-4 Band Assembly
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
FIRST GEAR RANGE ONLY - NO UPSHIFT 1st Gear Range Only - No Upshift SLIPS IN FIRST GEAR Slips in 1st Gear Burned Anchor pin not engaged Throttle Position Sensor Disconnected Damage Vehicle Speed Sensor (36) Disconnected Damaged Bolt not tightened 4WD Low Switch Disconnected Damaged Checks Causes Control Valve Body (60) The 1-2 Shift valve is sticking The spacer plate or gaskets are mispositioned or Case (103) The case to valve body face is damaged or is not flat Shift Solenoid Valves Stuck or damaged Faulty electrical connection 2-4 Servo Assembly (13-28) The apply passage case is restricted or blocked Nicks or burrs on the servo pin or on the pin bore in the Fourth servo piston is installed backwards 2-4 Band Assembly (602) The 2-4 band is worn or damaged The band anchor pin is not engaged Checks Causes Forward Clutch Assembly Clutch plates worn Porosity or damage in forward clutch piston
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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