You have, indeed, and you likely had no idea how it would, uh, fester.

That said, best of luck with your planned swap.
Speaking of swaps and the NSG370, a hypothetical for everyone participating...
Let's say you have a 2005 Jeep Wrangler Unlimited (non-Rubicon) with ~114k on the clock in quite good mechanical and structural shape, and with the much-loved NSG370 transmission backing up the powerplant. And let's say that, gearbox niggles aside, you're quite fond of this vehicle and plan on keeping it for the long haul. While the aforementioned transmission is currently functional, for the sake of long term use and reliability, you're considering a swap. Intention is to swap the transmission only, keeping the NP231 transfer case. No immediate need or emergency for the swap, so you can make solid plans and acquire the necessary bits to affect a swap over time. Going on the assumption that either the AX15 or NVG3550 are the best options to consider for cost and compatibility reasons, which of these two makes the most sense/would be the best choice, assuming normal utility usage of the vehicle?