Ok so now to answer the questions. First the reason for the idea of the Np231, is that Rick at Snoho. Trans. suggested it would work, and be a better t-case, than my "selectrac" Np229(not QT, I was wrong. I hate these cheesey names for the garbage that Jeep put in their vehicles). The previous Np228 was so worn out that the chain bound up, and cracked the case. Swapped it for the Np229, cause it was free, and got it going in a couple of hours. I want the Np205, cause it is the strongest t-case made for my applications, with 1.5" gears(bigger than the Atlas). The reason I asked about the Th400, is cause it was the only tranny that came to mind that was used with Jeeps, and GM who put it with the Np205. The other reason I asked if Np205's came in Jeeps, is cause I didn't want to do axle swaps(PITA), and the round Jeep bolt pattern, is the same as Chevy Np205's (PSD), I was thinking that if they were made for Jeeps, I could have avoided having a custom input shaft for the Np205 made to accept the 23 spline output of the tranny. Honestly if my wife didn't like this Waggy being an Auto so much, I would have changed the Auto, and put in a Np435, (same bellhousing to trans bolt pattern as some Jeep manual trannies) with the Np205. Btw I like the tranny I have(whether it be the TF999, or theTF727, I don't know the difference, and I know nothing about them other than they were also used in Chrysler products), I was just thinking that the Th400 might be stronger. Also I had the Np208 in 3 K5's, and I hated every one. Now if there was a 23 spline Np205 made, what it was in, and if it was for a Chevy, can the input shaft be installed into a Ford Np205 t-case? I will make an adapter, to bolt the tranny to the Ford T-case. And as for the cross member, cross members are easy to build. I really appreciate all the info.