Manual Third

With 4L60 (700-R4) Transmissions - 4WD Shown, 2WD Similar:

MANUAL THIRD

CONVERTER CLUTCH - RELEASED
OVERRUN CLUTCH - APPLIED
FORWARD CLUTCH - APPLIED
3-4 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, D3 oil from the manual valve is directed to the following:

1. 4-3 Sequence Valve
2. Part Throttle and Drive 3 (D3) Checkball (3)
3. 3-4 Shift Valve

D3 oil will close the 3-4 shift valve and allow the 4th signal oil to exhaust.

D3 oil combined with the 4-3 sequence valve spring force will close the 4-3 sequence valve to allow the fourth and fourth accumulator oil to exhaust and release the band. D3 oil then flows into the overrun clutch passage where it applies the overrun clutch to keep the forward sprag clutch from overrunning when engine braking is needed.

The forward and 3-4 clutches are applied. The 2-4 band is released. The transmission is in Manual Third, direct drive. The overrun clutch is applied to allow engine braking.

In manual 3rd, the converter is shown released, 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 E.C.M. could signal the solenoid to apply the converter clutch and the M.T.V. up and M.T.V. down valves could open.