In case anyone is interested in upgrading their BA10 or AX-5 to the beefier AX-15 I saw one listed on Ebay with a NP231 transfer case for $150. Since they are already a unit you wouldn't need to mess with changing the t-case spline. I'm not sure if there are other complications, but it looks like it might provide the major parts for a fairly simple tranny swap.
thats been pulled......i think the seller got wind of the value of those 2 componants. there is an auction for a np231 mainshaft, tail housing and tailcone thats at $25 at the moment......perfect for a core on sye conversions.