Manual Second

Manual Second:

MANUAL SECOND

CONVERTER CLUTCH - RELEASED
OVERRUN CLUTCH - APPLIED
FORWARD CLUTCH - APPLIED
INTERMEDIATE BAND - APPLIED

A forced 3-2 downshift can be accomplished by moving the selector lever from Third (3rd) Gear to Second (2nd) Gear position.

When the selector lever is moved to the Second (2nd) Gear position, RND4D3, 3rd clutch, and 3rd accumulator oil will exhaust at the manual valve. With no pressure to apply the 3rd clutch, or release the intermediate band, the transmission will shift to Second Gear.

The manual valve will also direct line pressure into the D2 passage. Drive 2 (D2) oil will act on the reverse boost valve to boost line pressure to 965 kPa (140 psi) which is required to prevent the intermediate band and forward clutch from slipping.

SUMMARY

The forward clutch and intermediate band are applied. The transmission is in Second Gear. Also, the overrun clutch is still applied to allow engine braking when needed.

In manual 2nd, 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.