Overdrive (4, 5, 6) Clutch Hydraulic Circuits (Applied in 4th, 5th and 6th gear)
Line pressure is supplied to the low reverse/456 regulator valve by the pump in every gear and manual lever position. To apply the low/reverse clutch, SSD supplies varying solenoid pressure to the low reverse/456 regulator and latch valves. As the regulator valve moves, it supplies the clutch control bypass valve and low reverse/456 latch valve with regulated line pressure through the CBR1/C456 circuit. The low reverse/456 latch valve directs the regulated line pressure to the opposite side of the low reverse/456 regulator valve through the CBR1/C456 FDBK circuit for gradual overdrive (4, 5, 6) clutch engagement.
To apply the overdrive (4, 5, 6) clutch, the position of the clutch control bypass valve allows the regulated line pressure in the CBR1/C456 circuit to supply the C456 circuit, applying the overdrive (4, 5, 6) clutch. Clutch control bypass valve latch pressure is supplied by the C456 circuit. The overdrive (4, 5, 6) clutch is applied in 4th, 5th and 6th gears.