Hi Wayne
Welcome to the neighborhood, I see you have become acquainted with a few of the members and for now, introductions are complete. I am not an English major so I am unable to contribute to the interaction you have with your keyboard, I can offer some thoughts regarding your vehicles problem.
1) Double check the transfer case fluid level: Remove 17mm allen cap/plug little to no fluid should flow from the fill hole. If a large amount of fluid begins to rush out then you may need a transfer case. The hydraulic pistons inside the case were/are prone to premature failure!!
2) Since the transmission was just reworked I would think that an installer would bleed the hydraulic lines at the transfer case. If I remember correctly you may need to bridge some electrical connections at the control unit in order to pressurize both circuits at the T-case. (I’ll get back to you with the specifics) Some of the early model T-cases are/were fitted with bleeder valves, later versions were not. You can try bleeding the lines at the T-case and see if it improves your current situation. You may want to also bleed the hydraulic system at the differential.
3) If the 2 previous suggestions do not resolve the situation I might direct my attention to the control valve assembly. The accumulator may be available separate through an after market source, you’ll need to do some leg work to find out. If not than you may need to succumb to MB’s proud price for the assembly, again more leg work on your part.
GOOD LUCK, oopsmybad

Good luck!