find a old 400 short shaft around here there were alot of the caddy .pon.buick.olds .in the scrap yards .or go to a trans shop you need the short out put shaft that s is held on the back of the planatery drum .i did this on long shaft s chevys the short shafts were hard to find .look on e bay or if you can not find any thing i could see it i can find you one