TH375/NP205 Combo?

[JMD]

Hi all,
I need to find a way to mate my NP205 that was originally behind a TH350 to a TH400. I know Advanced Adapters sells a kit to do just that, but the $700 price tag is a bit steep, and that doesn't include the cost of machining the Tcase housing to accept the bigger input shaft needed for the TH400s 32 spline output shaft.

I have the opportunity to buy a TH375. From what I've read, a TH375 is basically a TH400 with a 27 spline output shaft from a TH350, so it should fit the NP205 input shaft just fine.

My question is, if I bought the TH400/NP205 adapter plate, can I bolt that TH375 to my NP205? The only issues I can think of would be the length of the 375s output shaft, and the oil seal in the adapter might not be the correct size. Can anyone provide some insight?