most shift kits make the shift harsh and do nothing for the hold of the band or clutches They shim the accumulator pistons so they become ineffective The accumulator curcuits in a 700r4 only work below 5/8 throttle so what do these kits do at full throttle ? not much. All you need is a .500 boost valve and a super servo. you end up with a trans that shifts smooth at light throttle and chrip the tires when you get on it. The band and clutches are held firmer all the time .You can get both on ebay