Fast ratio steering box

Not sure but I think the fast ratio worm gear from Mopar only works in the 73-76 steering box. I had a worm gear I sold to a member here, it only worked in the 73-76 box. I have a factory fast ratio box from a 66 Cuda, I will check the turns for you, I got my car together before I got the box so it hasn't made it in the car yet.