Make sure you put the transfer case in neutral, or disconnect the driveshaft. The ZF-5 CAN NOT be towed any distance in neutral (from the road into the ditch is ok, not home). The ZF-5 has a fluid pump that is driven by the input shaft (Engine Running). If you tow it in neutral, like the older transmissions, you will burn the bearings up in the transmission, because the output shaft will still be turning the internals, with lubrication. There were several tow truck drivers in 87/88 that learned a VERY EXPENSIVE lesson. Just want to let you know.
Congrats on the new truck, hope you get it running without much trouble.