Park or Neutral - Engine Running (Neutral)

Park or Neutral - Engine Running (Neutral)





When the gear selector lever is moved from the REVERSE position to the NEUTRAL position the following changes occur to the hydraulic and electrical systems.


Manual Valve (404)
The manual valve is moved to the NEUTRAL position and blocks line pressure from entering the Reverse fluid circuit. The reverse fluid circuit is opened to an exhaust at the manual valve.


Reverse Band Assembly (615)
Reverse fluid exhausts from the reverse servo and the band release, shifting the transmission into NEUTRAL.


Reverse Boost Valve (367A)
Reverse fluid exhausts from the boost valve and line pressure regulation returns to the normal operating range.


Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly (34)
Reverse fluid pressure exhaust from the TFP manual valve position switch, thereby signaling the PCM that the transmission is in NEUTRAL (N) or PARK (P). The #5 ball check valve unseats, allowing reverse servo fluid to quick exhaust.


Pressure Regulator Valve (313) (Torque Converter/Cooler and Lube Circuits)
Line pressure at the valve enters the converter feed circuit which is then routed to the TCC control valve.


TCC Control Valve (335)
Spring pressure holds the valve in the released position. Converter feed fluid is directed to the release circuit. Release fluid seats #1 ball check valve and feeds the TCC blow-off. Release fluid feeds the TCC on the cover side of the pressure plate, exits the TCC through the apply circuit, then feeds the cooler circuit at the TCC control valve. Cooler fluid passes through the ball check valve, through the cooler, then returns to the transmission and feeds the rear lube circuit. A front lube circuit is fed from orificed line pressure.