Ok guys I think there is a little confusion as to how od trans works.Don your trans is the same as what we sell from monster. The shift points are controlled by the valve body in the trans. so the trans will shift automatic up or down. You would not have to hit the brake to shift down.
GM ran there's off the brake light switch to supply power to the trans to the convertor lock up automatic in third gear and 45mph. the brake light was used to unlock or break the circuit so
the convertor would unlock at a stop. if it did not the trans would try and push the car through the light.
Monster on the other hand has corrector the problem that was the death of many 700Rs with using a toggle switch to provide power to the trans with the option of unlocking the converted manually. To tow or drag race the car. Monster also fixed the 3rd gear lock up to 4th only.This was a problem for GM. there cars would surge when the car was at 45 because the trans would lock and unlock the convertor in third gear.
Hope this helps Tim