Manual Third

Manual Third:

MANUAL THIRD

CONVERTER CLUTCH - RELEASED*
OVERRUN CLUTCH - APPLIED
FORWARD CLUTCH - APPLIED
DIRECT CLUTCH - APPLIED

A forced 4-3 downshift can be accomplished by moving the selector lever from Drive (D) Range to Third (3rd) Gear.

When the selector lever is moved to the Third (3rd) Gear position, line pressure is blocked from the RND4 passage, and D3 oil from the manual valve is directed to the following:
1. Overrun Clutch Checkball (11)
2. Overrun Clutch
3. 4-3 Control Valve
4. Part Throttle and Drive 3 (D3) Checkball (3)
5. 3-4 Shift Valve

D3 oil will open the 4-3 control valve and close the 3-4 shift valve to allow 4th clutch and 4th accumulator oil to pass back through the 3-4 shift valve and exhaust at the 4-3 control valve. D3 oil will also pass through an orifice and apply the overrun clutch to keep the overdrive roller clutch from overrunning when engine braking is needed.

SUMMARY

The forward and direct clutches are applied, the 4th clutch is released; the transmission is in manual 3rd, direct drive. The overrun clutch is applied to allow engine braking.

In manual 3rd, the converter clutch is shown released by the engine vacuum switch and there is no Modulated Throttle Valve (M.T.V.) up or M.T.V. down pressure. This is assuming the throttle is released. If the throttle is opened sufficiently, the converter clutch could engage and the M.T.V. up and M.T.V. down valves could open.