727 Shifts Down to 2nd at highway speeds

The linkage on the torque flight is actually called throttle pressure. It increases line pressure as you open the throttle. It is important for durability of the trans. If you have the linkage hang up at full pressure it will shift very hard into drive and reverse. The upshifts will be late and downshifts early and hard. You can drive it with it unhooked to test but go easy.