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fluid pressure switch. The combination of the opened D3 switch and the closed D4 switch signals 1-2 Shift Solenoid (SS) Valve When Manual Third is selected, the PCM de-energizes the 1-2 SS valve to immediately downshift 3-4 Shift Valve D3 fluid pressure assists spring force to keep the valve in the downshifted position against the 2-3 Shift Valve Train With the 2-3 SS valve de-energized and open, actuator feed limit (AFL) fluid acting on the 2-3 Overrun Clutch Feed Checkball (#5) Overrun fluid pressure seats the ball against the empty D2 fluid circuit. Overrun Clutch Control Checkball (#6) Overrun fluid pressure seats the #6 checkball and is orificed (#20) to fill the overrun clutch feed 3-4 Relay Valve and 4-3 Sequence Valve 4th signal fluid pressure is exhausted from the end of the 3-4 relay valve. Overrun clutch feed Overrun Clutch Piston Overrun clutch fluid pressure moves the piston to apply the overrun clutch plates. The overrun Overrun Clutch Air Bleed Checkball This ball and capsule is located in the overrun clutch fluid circuit in the oil pump. It allows air to
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
exhaust from the circuit as fluid pressure increases and also allows air into the circuit to displace Torque Converter Clutch and Torque Converter Clutch PWM Solenoid Valve The PCM de-energizes the TCC solenoid valve and operates the duty cycle of the TCC PWM Pressure Control (PC) Solenoid Valve The PC solenoid valve operates in the same manner as Overdrive Range, regulating in response to Manual Third - First and Second Gears: Overrun Clutch Released In Manual Third, the transmission upshifts and downshifts normally between First, Second and
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 556: Manual Third Gear MANUAL SECOND GEAR A manual 3-2 downshift can be accomplished by moving the gear selector lever into the Manual Manual Valve The selector lever moves the manual shaft and the manual valve into the manual second (2) Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly The D2 fluid is routed to the TFP manual valve position switch where it opens the normally
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
pressure switch open, the TFP manual valve position switch signals the PCM that the transmission Third and Fourth Gears Prevented 2-3 Shift Solenoid (SS) Valve The PCM energizes the 2-3 SS valve and the AFL fluid pressure holds the 2-3 shift valve in the 2-3 Shift Valve Train The D2 fluid is routed between the 2-3 shuttle and the 2-3 shift valves and causes the following: Regardless of the operating conditions, the D2 fluid pressure holds the 2-3 shift valve in the The 2nd fluid is blocked from entering the 3-4 signal fluid circuit and the 3-4 signal fluid The 3-4 clutch cannot apply with the 3-4 signal fluid exhausted. Therefore, third and fourth The 2nd fluid feeds the servo feed fluid circuit, but the 2nd fluid circuit has no function in The AFL fluid is blocked by the 2-3 shift valve and the D432 fluid circuit is exhausted The overrun fluid is exhausted through the 2-3 shuttle valve. 1-2 Shift Valve The 1-2 SS valve is OFF, the signal A fluid exhausts through the solenoid and the spring force First Gear Prevented The prevention of first gear is controlled electronically by the PCM through the 1-2 SS valve. Overrun Clutch Remains Applied Overrun Clutch Feed Checkball (#5)
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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