i am new to the fordforum and need some help.. i race a 80's model ltd on a dirt circle track and am using a c4 tranny behind a 12-1 351w. those chevy guys are useing those powerglides. i all ready have a full manual reverse pattern valve body, an expensive set of kevlar clutches. what i am wondering is if there is any way to change the amount of rotating mass in this c4 to make her turn up quicker?? any help in this matter would be greatly appriciated..