The transmission in that car should be a 722.366. In All 722.3 transmissions the vacuum modulator controls shift “FEEL” only; it’s the load control for working pressure. The cable controls shift timing only. With the cable removed all up shifts should be stack and early. You have two different and separated drivability problems, each controlled by different components.


I am not sure if that car has an E/S mode switch if so, try this first; that car has an up shift delay vacuum actuator. Disconnect and plug the vacuum feed line to the switchover valve. Reconnect the Bowden cable, if the Trans shift on time, the late shift problem is in the up shift delay system. The modulator may have a vacuum (harsh shift) problem as well.

If not it’s the valve body.

Water contamination in the valve body can cause the harsh and late shifts, the plastic accumulators can crack.