3" body lift?
I have 235x75x15's (28.8" tires) and they do fit my '91 2wd, but they rub the inner wheel well a little bit when the steering wheel is full lock to the left. An extra 1" would give it full clearance with no rubbing, but still would be low on clearance. That clerance becomes a problem when the tires hit the body's fender if I hit a speed bump really fast.
So to mount 30" tires, I'd say you need at least 2" of lift to fit without rubbing, but at least 3" to get adequate clearance. 4" would make it look better and be safe.
I don't know all that much about the gen2 rangers, but I've seen 3" body lifts in many places. For example here's on on eBay for ~$120 shipped: