91 Rangers have I beam suspensions. there should be a eccentric bolt on the top of the spindle. but if you've lowered it you wont be able to adjust it enuff, i suggest saving sum money and having a mustang 2 or toyota truck front suspension welded on
is it bagged or juiced? cause if it has lowered springs or cut springs you can always put some dropped I beams in. they lower it about 3 inches and maintain the proper camber, but if it has bags or juice the only thing you do is put a different clip on the front.