I know the engine and tranny were not stock, he swapped those in. But as far as I know the springs and axles were already on the truck. These guys were pretty prone to swaps, they had a '59 Chevy Apache with running gear from a '79 Ford 1/2 ton, right down to the 300 inline six. If someone told these guys it couldn't be done, that was all the more reason to do it. But like I said, the axles were on the truck when he got it. I cannot say that the previous owner did not swap the axles, but they were there when he got it. I did a little searching and could not find anything to comfirm whether or not it could have had them stock.
The jeeps with the pass through diffs were actually not Jeeps at all, they were M-151's made by AM General. The M38's were all leaf sprung solid axle rigs and made by Willys or Kaiser. Early models were similar to the CJ3 flat fenders and the later models were the mil spec version of the CJ5 (or rather the CJ is the civvy spec version of the M38).