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Before comitting to replacing the ring gear, check the starter gear to ring gear clearances (stain the starter gear teeth with "Prussian Blue", and the lead in angle of the ring gear teeth from the direction of the starter (they should not be flat). if clearances are too great, or too small, the starter gears fail pretty quick. The trick is to identify why the clearances may be off. It may just require a shim, or there may be few loose bolts around the bellhousing. Also check for runout on the ring (flyweel gear) as it may have some broken welds, broken teeth, etc, or the flywheel itself may need some attention if it has begun to loosen from the crank or broke. If the ring gear is damaged from use, or distorted (they do wear out too), certainly a replacement is in order. But if everything about the ring gear, bell housing, etc is in order, it might be the quality of parts that the rebuilder used. More than likely any design differing from the original is likely to be in the angle ground on the teeth of the ring gear, most likely a higher degree angle to reduce the amount of impact force from the starter gear as it hunts for engagement with the ring gear.
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