A JB conversions input shaft and a clocking ring on the Jeep t-case would allow you to bolt up the trans and t-case without any kind of adapter. The only problem with that is you then have no VSS for the GM computer. The hole pattern on the stock trans tail housing adapter is the same as the Jeep, just rotated 90*. 5 out of the 6 holes are symmetrical, one is offset. I almost went this route, but without having a VSS the cost associated with adding that drove me to buy a NP241c. Cost me $117 for the t-case shipped to my door, $400 and change for a JB conversions SYE for it with the stock Chevy VSS built in. Factory drop was a couple inches below the frame of the TJ, so I put a clocking ring on it to get it just about flush with the bottom of the frame rail. Total cost was about the same as the adapter setup from AA, I didn't have to deal with them, and I ended up with a stronger t-case at the same time.
99 Wrangler Project Detroit Mongrel 5.3/4l60e/Atlas HPD60/14B coilovers etc...