I ran into the same problem running corvair trans in the reverse rotation. Putting power to the coast side of the ring gear produced gobs of side thrust. Like that technical term.... Gobs?? Enough to push the cast iron case apart. Also the syncro rings didnt like going the wrong way either. The grooves in the syncro rings are actually threads and tend to screw them selves onto the cone slowing the gears to the same speed. Running them in reverse are much less effective. Having a reverse rotation engine is not a big deal at all. I talked to several cam companies and they all can grind what ever I wanted in a reverse grind. Keep in mind the rotation direction of the dist and the oil pump, they have to turn the normal direction.
Wayne
