Fluid Pressure Directed in Preparation for a Shift

Manual Valve 

Mechanically controlled by the gear selector lever, the manual valve is in the Park (P) position and prevents line pressure from the pressure regulator valve from entering the reverse and drive circuits.

R-1/4-5-6 Pressure Control (PC) Solenoid 3 

The R-1/4-5-6 pressure control solenoid (PCS) is energized (HIGH) allowing actuator feed limit fluid to enter the PCS R-1/4-5-6 CL fluid circuit. PCS R-1/4-5-6 CL fluid is then routed through orifice #22 to the 4-5-6 clutch boost valve and through orifice #21 to the R-1/4-5-6 clutch regulator valve.

R-1/4-5-6 Clutch Regulator Valve 

PCS R-1/4-5-6 CL fluid at the R-1/4-5-6 clutch regulator valve moves the valve against R-1/4-5-6 clutch regulator spring force and R-1/FDBK fluid. This allows line pressure to pass through the valve and enter the R-1/4-5-6 CL FD circuit. R-1/4-5-6 CL FD is then routed to clutch select valve 2.

Shift Solenoid 1 

Shift Solenoid 1 is energized (ON) allowing actuator feed limit fluid to enter the Solenoid 1 circuit. Solenoid 1 fluid is routed to the #2 ball check valve and through orifice #10 to the torque converter clutch (TCC) regulator valve and shuttle valve (SHTL).

TCC Regulator Valve and Shuttle Valve 

Solenoid 1 fluid is routed to the TCC regulator valve and shuttle valve and moves the valve against TCC regulator valve spring force.

#2 Ball Check Valve 

Solenoid 1 fluid seats the #2 ball check valve against the reverse fluid passage and fluid is forced through orifice #15 into the CSV 2 enable fluid circuit.

Clutch Select Valve 2 

CSV 2 enable fluid is routed to the clutch select valve 2 and moves the valve against clutch select valve 2 spring force. This allows R-1/4-5-6 CL FD fluid to pass through the valve and enter the R-1 supply circuit. R-1 Supply fluid is then routed into the R-1 fluid circuit and, through orifice #18. R-1 fluid is then routed to the low & reverse clutch assembly in preparation for a shift into low or reverse gear.

Shift Solenoid 2 

Shift Solenoid 2 is energized (ON) allowing actuator feed limit fluid to enter the Solenoid 2 fluid circuit and is then routed to the #3 ball check valve and through orifice #13 to the clutch select valve #3.

3-5 Reverse Clutch Regulator Valve 

Actuator feed limit fluid is routed through the valve and into the PS 2 fluid passage. PS 2 fluid is then sent to the normally closed #2 pressure switch and opens the switch.

#3 Ball Check Valve 

Solenoid 2 fluid seats the #3 ball check valve against 4-5-6 CL fluid passage and fluid is forced through orifice #13 into the CSV 3 enable fluid circuit. CSV 3 enable fluid is then routed to the clutch select valve 3.

Clutch Select Valve #3 

CSV 3 enable fluid moves the clutch select valve 3 against clutch select valve 3 spring force.

Compensator Blow Off 

Line pressure is routed through orifice #17 to the compensator feed circuit. Compensator feed fluid enters the compensator blow off circuit and fills the 4-5-6 dam piston area.