I have 93 vert. with 91,000 miles its stock with most the bolt ons plus lowering springs koni 5 ways new sway bars this and that no real h/p mods yet but comming soon... I have 410s with stock aod i want to put a trsnsgo shift kit in and was told the input shaft breaks with a stiff shift is their truth to this r what i was told i need to change the input shaft if i want to instal the shift kit??? thanks for any help....