3-4 Shift Accumulation

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3-4 Accumulator Piston

Fourth band fluid actuates the 3-4 accumulator piston. The piston cushions the apply of the fourth band assembly during a 3-4 shift. The 3-4 accumulator fluid on the spring side of the 3-4 accumulator piston is forced back through its circuit to checkball #3.

#3 Checkball (Primary Accumulator, 3-4 Accumulator)

The #3 checkball is located in the accumulator housing. The 3-4 accumulator fluid pressure unseats the checkball. The 3-4 accumulator fluid then enters the primary accumulator circuit and is routed to the 1-2 & 3-4 accumulator valve.

1-2 & 3-4 Accumulator Valve

The 1-2 & 3-4 accumulator valve is biased by torque signal pressure, third clutch pressure, and by orificed primary accumulator fluid pressure. The valve regulates the exhaust rate of primary accumulator fluid during a 3-4 shift.