Re: Need some guidance
You should have the NV 242 T-case in your jeep, which uses the ATF+4 fluid, same as the transmission. Some guys run amsoil in both without any problem. An other member will hopefully chime in on which type to use.
I don´t have a NV242 in my jeep, but the NV 247, but regarding removal/installation its almost the same. First remove the front and rear propeller shafts. Now remove the T-case selector cable, T-case position sensor connector and the breather tube.
The T-case mount serves also as rear mount for the engine/transmission, so you will have to put a jack with a large piece of wood under the transmission pan to take over the weight. Then you can remove the 8 bolts which hold the crossmember in place. Its maybe a good thing to leave the T-case connected to the crossmember and remove it together (i didn´t do it like this, but i think it is possible) . You then unbolt the T-case from the transmission (6 nuts on studs) and then you can slide it backwards a bit to release the studs and the transmission to T-case spline and it can be lowered. Best to have two persons carrying the weight, because lying underneath its quite a heavy thing.
The T-case front seal is mounted in the front bearing retainer, which is mounted with 4 bolts.(see attached page). Don´t know how the transmission output shaft seal is mounted.