NP205 32 spline fig8 to GM NV4500???

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Question on options for attaching a '05 GM NV4500 to a NP205 with 32 spline input and short stick out, fig8. The NP205 is from a 1981, 1 ton with turbo 400 transmission, it has the adapter attached with the 6 bolt input.

This all new to me, read a lot of post here by many for a while. Hoping to go with the 205 if not to hard/overall length vs a 208 ( have several from CUCVs) or 241. The round 6 bolt input 205 are $ 1,000 here not rebuilt. This is for a '72 K10 short bed with 3/4 ton 72 axles.

My research has come up with the following, interested in pros and cons of different options along with others for the NP205, not planing to use the original turbo400 adapter.

1). Use a Northwest Fab Works 5/8 thick billet steel adapter between 205 and NV4500. Would use ORD dual shift. Is the NV4500 output shaft directly compatible - bolt up without changes needed? Is this ok without the trans/TC adapter with its support feet, additional support can done another way if needed. For example use a steel NV4500 tail adapter vs stock alu. one?

2). Use the stock steel turbo 400 adapter with longer NV4500 output shaft?

3). Use AA adapter kit for this application, at about $550, do not understand why you need the different tail shaft adapter?

4). Get a round 6 bolt case. Where to find?

Thanks,
Les

Note: if this question would be better placed as a follow-on to existing thread to help keep this subject better organized, e.g. Larry, Steve ..... please let me know. As I do not know the exiting threads on this.