[clinebarger]

OK, Time for the other side of the Valve Body.

Lets start with the M.T.V. Up & Down Valves. M.T.V. stands for Modulated Throttle Valve.

Modulated T.V. Up-Shift Valve Info.

TV oil (From the TV Valve) increases with throttle opening & delays Upshifts under heavy acceleration.

At light throttle/Part throttle (PT) line pressure ramps-up quickly, If TV pressure was sent directly to the TV Shift Valves....PT Upshifts would not take place until a pretty good speed was reached (For Governor Pressure to overcome TV pressure)

The MTV Up valves job is to Modulate TV pressure sent to the 1-2, 2-3, 3-4 & Converter Shift Throttle Valves under 50% throttle.

The MTV Up valve starts to open around 10% throttle & is fully open around 50% throttle (Depending on Spring weight)

Under 10% throttle, TV pressure takes No Part in Upshifts, It is handled 100% by Governor pressure.

Over 50% throttle, All TV pressure is sent to the TV Shift Valves, Now the upshifts can be delayed by full TV pressure under hard Throttle.

This chart may help.