For me it was skid plate removal and cross member removal to get to rear pan bolts, no linkage removal. "Filter" is just a screen that can be cleaned and put back; I don't think it even has a gasket but Mitsu parts guy should be able to look it up. I can't remember if I supported the tranny but can't hurt, and angled on jack stands should be OK.

92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles