Converter Clutch Released

Overdrive Range - Third Gear:

OVERDRIVE RANGE - THIRD GEAR

SOLENOID "A" OFF
SECOND CLUTCH - APPLIED
1/2 SUPPORT ROLLER CLUTCH - OVERRUNNING
SOLENOID "B" - OFF
THIRD CLUTCH - APPLIED
FORWARD BAND - APPLIED
THIRD ROLLER CLUTCH - HOLDING

To obtain third gear, the PCM receives input signals from the Vehicle Speed Sensor (VSS) and Throttle Position Sensor (TPS) in order to "deenergize" or "turn off current" supply to solenoid "B" (315) allowing solenoid "B" fluid to exhaust. When this occurs, spring force moves the 4-3 manual downshift valve (360), and, line pressure at the end of the 2-3 shift valve (357) moves the 3-2 manual downshift valve (356) against spring pressure. Line pressure also at the manual 3-2 downshift valve (356) enters the solenoid "B" off passage and assists in preventing the 1-2 shift valve (318) from moving. When the 2-3 shift valve (357) moves, D-4 fluid enters the 3rd fluid passage. The 3rd fluid passage feeds fluid to:
^ the converter clutch solenoid (315), where it exhausts through the solenoid
^ the 1-2 shift valve (318), and,
^ to seat #9 checkball (372) forcing fluid through an orifice and into the 3rd clutch passage.

The 3rd clutch passage directs fluid to seat #4 checkball (372) sending fluid into the 3rd Clutch Lo-1st passage to apply the 3rd clutch. 3rd clutch fluid pressure is also sent to the 2-3 accumulator piston (136) and forces the piston against the spring and 2-3 accumulator fluid to cushion the 3rd clutch apply. The 2-3 accumulator fluid is then forced to exhaust at the 2-3 accumulator valve (343). In third gear, the input clutch is released allowing input clutch apply fluid to exhaust through the 3-4 shift valve (362) into the input clutch feed passage. At the 2-3 shift valve (357), exhausting input clutch apply fluid is directed into the D-3 passage and out the manual valve (404).

Solenoid "B" (315): De-energizes, allowing solenoid "B" fluid to exhaust through the solenoid. Spring pressure forces the 4-3 manual downshift valve (360) to move while line pressure moves the 2-3 shift valve (357) and 3-2 manual downshift valve (356).

#9 Checkball (372): Located in the valve body (300), forces 3rd fluid through a feed orifice and into the 3rd clutch passage.

#4 Checkball (372): Located in the channel plate (400), directs 3rd clutch fluid into the 3rd clutch/ lo-1st passage to apply the 3rd clutch.

2-3 Shift Valve (357): When shifted, allows D-4 fluid to enter the 3rd passage to: stroke the 2-3 accumulator piston (136); apply the 3rd clutch; and, direct fluid to the converter clutch solenoid (315). The 2-3 shift valve also allows the input clutch apply fluid to exhaust into the D-3 passage and out at the manual valve (404).

2-3 Accumulator Piston (136): Cushions the apply of the 3rd clutch by using 3rd clutch fluid to force the piston against spring force and 2-3 accumulator fluid.

2-3 Accumulator Valve (343): Regulates the exhaust of 2-3 accumulator fluid during 3rd clutch apply.