spindle question

I have a 91 B2600i on 20x9 wheels with a +25mm offset will I need drop spindles to tuck them when I bag it I also have 4wd fenders on it.

you need more offset or less width. you can tuck a 8" wide wheel with a 25mm offset but 9" is too much.

you'll need more like an +45 to tuck an 8" wide wheel and that's without drop spindles.

and the drop spindles will push your wheel out even farther , needing more offset