I have a 35 spline Detroit for 4.56 and up and was attempting to install RC 5.13 thick gears. I ran into a problem of the ring gear hitting the pinion and not allowing the Detroit to position itself fully inside the diff. I called up Randy's R&P thinking there was a thin gear and explained the situation. They told me there were no thick and thin RC gears for a Dana 60, just the thick ones. They did say there was a different Detroit for RC 60's, but sounded unsure. Anyone have any insight to this?