I went and looked at the 1997 axle and it appears to be a H233b. Same measurement from backing plate to backing plate and same measurement center to center on the springs. Appears to have the same bolt pattern around the third member. The ABS connection looks a little different at the pinion, but that doesn't matter to me.
Still hoping someone can confidently say if this swap will work & if the center chunk will swap between the 93 & the 97 housings.
From this post, I'm starting to think it will fit right in. I know mine has 31 spline axles from my locker. I've checked cross refs for the brake pads, cylinders, soft center brake line, inner and outer bearings and they are all used both in my 93 D21 and in the 95-97 Nissan Truck. I'm thinking about going for it and reporting back if no one tells me I'm nuts.
https://www.clubfrontier.org/threads/ha ... nfo.37358/