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upshifted position, the following changes occur: AFL fluid is routed through the 2-3 shift valve and fills the D432 fluid circuit. 2nd fluid is blocked from entering the servo feed fluid circuit and is orificed (#28) into the Servo feed fluid exhausts past the valve into the 3-4 accumulator fluid circuit and through an 3-4 Clutch Exhaust Checkball (#4) 3-4 signal fluid unseats the ball and enters the 3-4 clutch fluid circuit. 3-4 Clutch Piston 3-4 clutch fluid pressure moves the piston to apply the 3-4 clutch plates and obtain 3rd gear. 3rd Accumulator Checkball (#2) 3-4 clutch fluid pressure unseats the ball and fills the 3rd accumulator fluid circuit. 3rd Accumulator Exhaust Checkball (#7) 3rd accumulator fluid seats the ball against the orificed exhaust and is routed to the released side 2-4 Servo Assembly 3rd accumulator fluid pressure acts on the release side of the 2nd apply piston and assists servo Move the apply pin to release the 2-4 band. Act as an accumulator by absorbing initial 3-4 clutch fluid to cushion the 3-4 clutch apply 3-2 Downshift Valve 3-4 clutch fluid pressure moves the valve against spring force. This opens the valve and allows
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
3-2 Control Solenoid Valve and 3-2 Control Valve The solenoid remains open and routes AFL fluid into the 3-2 signal fluid circuit. 3-2 signal fluid 1-2 Shift Solenoid (SS) Valve and 1-2 Shift Valve The 1-2 SS valve remains de-energized and signal A fluid is exhausted through the solenoid. Also, 3-4 Shift Valve Spring force holds the valve in the downshifted position, blocking 3-4 clutch fluid in preparation Torque Converter Clutch TCC Solenoid Valve Under normal operating conditions, in Overdrive Range-Third Gear, the PCM keeps the normally
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 552: Overdrive Range, Third Gear OVERDRIVE RANGE, FOURTH GEAR - TORQUE CONVERTER CLUTCH APPLIED At higher vehicle speeds, the Hydra-matic 4L60-E transmission uses an overdrive gear ratio 1-2 Shift Solenoid (SS) Valve Energized (turned ON) by the PCM, the normally open solenoid closes and blocks signal A fluid 2-3 Shift Solenoid (SS) Valve De-energized (OFF) as in third gear, the 2-3 shift solenoid valve exhausts signal B fluid through 1-2 Shift Valve D432 fluid pressure from the 2-3 shift valve and spring force hold the valve in the upshift position
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
against signal A fluid pressure. 3-4 Shift Valve Signal A fluid pressure moves the valve into the upshift position against the spring force. In this 3-4 Relay Valve and 4-3 Sequence Valve 4th signal fluid pressure moves both valves into the upshift (fourth gear) position against the Orificed (#7) 2nd fluid is routed through the 3-4 relay valve and into the servo feed fluid Servo feed fluid is routed through the 4-3 sequence valve and into the 4th fluid circuit. 3-4 accumulator fluid routed from the 2-3 shuttle valve is blocked by both valves. 2-4 Servo Assembly 4th fluid is routed through the center of the servo apply pin and acts on the apply side of the 4th 2-4 Band Apply Accumulation 2-3 Shift Valve Train The valve train remains in the upshift position with the AFL fluid pressure acting on the 2-3 shift 3-4 Accumulator Assembly 3-4 accumulator fluid pressure moves the 3-4 accumulator piston against spring force and orificed 3-4 Accumulator Checkball (#1)
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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