My old man and I are in the the process of installing a Behlen Overdrive unit on a 1936 Unstyled A. We have removed the old shafts and placed the new Overdrive shafts in. All gears and shifter plates and shifter shaft are all back in place. Our only issue right now is we can't get the snap ring back inside the housing of the case the keep the sliding shaft from sliding out. We are wondering if it is even possible to get the new sliding shaft set in far enough to put that snap ring back in? Once we put the Overdrive box on the sliding shaft doesn't appear to be able to move far enough to cause any issues there. We are just curious if we would be all right to finish assembling things as is?