Yes, a 1970 Jeep cj5 does have the low range transfer case if it is a 4wd, however, not all 1970 jeep cj5s were equipped with four wheel drive.
The transfer case does, yes.
NP243
It is on the center of the rear of the transfer case.
The transfer case uses ATF.
No. A 1993 Jeep does not have such a part.
Depending on what transfer case is used, most of the time, yes they will fit.
New process 231 transfer case
The fill plug is on the center of the rear of the transfer case.
No.
The transfer case takes atf, use dextron.
about $1000
Np231