Fourth Band Applies

WARNING: This page is about a different variant/trim than selected.

Manual Valve

Line pressure at the valve enters the D21 fluid circuit which is then routed to the 2-3 shift valve.

2-3 Shift Solenoid (SS) Valve

The 2-3 SS valve de-energizes (turns OFF) in order to allow fluid from the 2-3 SS valve to exhaust through the solenoid. In the absence of 2-3 SS valve fluid pressure at the 2-3 shift valve, spring force acting on the end of the valve moves the valve into the downshifted position.

2-3 Shift Valve

Spring force hold the 2-3 shift valve in the downshifted position. D21 fluid passes through the valve and orifice #10, where the fluid enters the orificed D21Y circuit. Orificed D21Y fluid is then routed to the 3-4 shift valve. D21 fluid also passes through orifice #9, where the fluid enters the coast clutch circuit, and the fluid is routed to the 3-4 shift valve. Coast clutch fluid is then directed to the coast clutch piston, and the fluid applies the clutch.

3-4 Shift Valve

Spring force and D321 fluid hold the 3-4 shift valve in the downshifted position. The 3-4 shift valve allows orificed D21Y fluid to enter the fourth band feed circuit. Fourth band feed is then routed to the 1-2 shift valve.

1-2 Shift Valve

Spring force holds the 1-2 shift valve in the upshifted position. The 1-2 shift valve allows fourth band feed fluid to enter the fourth band circuit.

3-4 Accumulator Assembly

Fourth band fluid is routed to the 3-4 accumulator piston. The fluid actuates the piston during the apply of the fourth band assembly.