Im currently building a micro sprint , and I want to find a shaft driven rear end for it. The problem is that I need to know the spline size for the rear end to determine what will work. The axels avalible are 1 3/4 and the splines are 37. If its too big I can use a non splined axel with a splined sleve on a 1 1/4 or 1 3/8 axel. Any help would be great.