As expected, there was a pinhole in the trans dipstick tube. I enlarged it with my pick.
The new one fit in nicely but was a little shorter. It came with a shorter dipstick also, with the correct depth markings.
Played a fun game of where's the socket tightening down the tube mount. It fell off the 4' extension.
I was working at the red arrow from behind the transfer case because that was easier.
You can't get to it from underneath with the exhaust and front drive shaft installed, but you can start it from above if you're willing to climb over the engine and reach down the firewall.
Take a look at the previous pictures and try to find it please.