It is on the center of the rear of the transfer case.
about $1000
Np231
diagram from front vacuum motor to transfer case of 1993 Jeep Wrangler
The transfer case takes atf, use dextron.
Yes. transmission in Park, transfer case in neutral.
About 1.5 quarts
Np 231
yes
The Electronic Control Module (computer) on a 1989 Jeep Wrangler is house in a metal case on the firewall. It is on the passenger side of the engine compartment.
they might be different on some models but they would be interchangeable either way.
There should be a tag on the back of the case that has that info on it.