I don't know for sure if the ID of the two ring gears are the same or not. What we have determined here lately is that if you have a 134 tooth ring gear you need a 9 tooth starter drive. If you have a 133 tooth ring gear you need a 10 tooth starter drive. I don't know how much difference it makes going from 9/134 to 10/133 ratios. I do know that either the 9 or 10 tooth drives can be used in either starter.
In my engine book for the C263 in the 656 it shows a direct replacement of the 133 tooth for the 134 tooth gear. But it has a part number of 388302R2 instead of 367042R1 for the 134 tooth ring gear so maybe there is a difference.
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