You cannot "convert" an AWD transmission to 2WD or vice versa, you'd have to take the whole thing apart.
The transmission
yes I just instaled a 1990 in my 1988
It'll fit, but it won't work. The 94 transmission is electronic, and interfaces with the ECM. It won't be compatible with the 91 in that regard.
Both use the 4.3 V6 and 4L60E transmission (assuming they're both auto). They'll work.
It will work as long as it fits.
NO won't work. The wiring harness for the transmission on the 90 model will not hook up to the 97 4L60E transmission. And the ECM / computor on the 90 model will no operate the 97 electronic transmission. You can NOT use anything newer then a 1991
cruise control does not work on 98 astro van
there are 3 transmission so your question is impossible. 3,4,5, speed are all 100% vastly different, in all ways.
No.
A person can get the ship to work on Astro Nights by obtaining the green rod from the alien. A bag of manure will also work to fuel the ship.
it will work
Yes it does.