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There were some TH400/203 combos made in the 70's but they are sorta rare. If you really want a 203 behind your TH400 you will need to find that adapter and a 32 spline input NP203.
Its a doubler, I have the adaptor for a TH400 to 203 its too short the TH400 splines are longer for the 208 so I need a longer adaptor or I have to drill the case or make or buy a new one