You got a non running '92 Bravada for $400...you did good.
Evidently it needed some long overdue TLC and you're on top, congrats.

Now the most important question...what color is it?
I don't use synthetics but have no issues to complain about.
Regular Dextron III trans fluid in the trans. and transfer case and Kendal High Perf. 10w-40 motor oil in my 184k street '92.
Eric goes off road with his, he may be more particular....well, his is kinda particular anyway but ...uhhhh.