hey luis.
thanks for posting a link to the speedo gear issue. that sure looks like a piece of stamped sheet metal to me. there are only a couple of items in these t-cases made from that material:
1) front output bearing slinger ( doubt it failed )
2) both the oil funnels
3) the oil slinger on the idler gear
i would suspect that one of the two later options is the cause of the problem. either way, i would find out what it is before it's too late. given the amount of issues you've had with the truck since the swap was done, i'd be leary to take it back to whoever did the job originally. so far i'm aware of three issues with the cruiser that should'nt have happened in the first place. none of them give me any confidence that the work was done properly or with much care. and that really sucks. i know that most of us try to do the job as best we can and with pride......
anyhow, given the issues with the trans, clutch and t-case i'd say it's time for the combo to come out. i would take edwin up on his offer and do it at his shop. you'll be in good hands and everything you need should be available to you there, including edwin's knowledge which counts for a lot.
i'll be more than happy to help with whatever i can, be it parts or technical know-how. i have a lot of t-case and transmission parts as well as all the gaskets and seals on hand. let me know what you need and can't get locally and i'll make it happen. i still owe you as well, really appreciate your effort to get those fuel cans for us.
don't hesitate to call!!!!!!

hth
georg