I took my th400 apart to install a shift kit, and realized theres only 2 check balls in when there should have been 6. How if I want to set this up to heavy duty stage 1, it says I have to get all 6 balls. Does anyone know where I can get these? Do they sell them at pep boys? I dont want to call and ask if they have check balls, they wont know what I'm talking about.