To run that FDR you need a 30 rather than a 36, that'll give you 5.66 FDR.
Whether you'll be able to get a proper mesh on this gearing is anyone's guess... It might be a case of needing a bigger spur, don't really know.
5.5 - 6.0 in 13.5 seems very high to me for a 13.5, is the place really small or something?
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