Detent Downshifts - Valves In 2ND Gear Position

In this range, the forward clutch is applied and the intermediate band is applied.

While operating at speeds below about 65 mph, a forced detent 3-2 downshift is possible by depressing the accelerator pedal fully. This positions the throttle valve (TV) plunger to permit shift TV oil to enter the detent passage. This oil, called detent oil is then routed to the 2-3 throttle valve, 1-2 throttle valve and RNDI and detent check ball.

Detent oil from the TV plunger flows to the 2-3 throttle valve. Detent and part throttle (P.T.) oil pressure combined with the 2-3 spring force will close the 2-3 shift valve against governor oil and allow direct clutch oil through two orifices to exhaust at the 2-3 shift valve.

At vehicle speeds above about 50 mph, governor oil acting on the 3-2 control valve will close it. Exhausting direct clutch accumulator oil from the intermediate servo will seat the direct clutch accumulator check ball and flow through another orifice controlling the intermediate band apply for a smooth 3-2 downshift at high speeds.

A detent 2-1 downshift can be obtained at speeds below about 30 mph, because detent oil pressure and the 1-2 spring force acting on the 1-2 throttle valve will close the 1-2 shift valve, shifting the transaxle to first gear.

Detent oil acts on the RNDI and detent check ball but will not unseat it because RNDI oil is at a higher pressure.