Lokar Kickdown Linkage

Do i need the full travell of the kickdown lever? When i use the original hole i am only utilizing about half of the travel of the kickdown lever.

May or may not. Depends on how the valve body is set up. As Junior said start with it set so it pulls the lever all the way at wide open throttle. Test drive it. If it shifts ok, great. If it hangs in 1st and 2nd too long back off the adjustment a little at a time until it shifts where you want it to.