No.. 2-wheel and 4-wheel drive transmissions will NOT INTERCHANGE
You can if the 1990 truck is a 4x4.
Yes you can it will bolt right up to it.
YES. If it is a 700R4 and is a 4x4 transmission. That truck came factory with a 700R4
700R4
700r4
No
Factory put 700R4 transmissions in that year 1/2 tons.
That would be the 700R4
700R4
700R4
700R4
700R4 from the factory.