rust,suspension and steering,get her undersealed this summer,get hera service,engine oil and brakes and filters,grease all your steering grease point and your drive line with a grease gun,change out your diff oils and check for leaks on the drive line,gearbox and transfer case oils should be changed out if you dont know the car history.
heavy on fuel,ajust your driving,its a heavy car with big engine,foot to the floor you will pay for it,there not really ment for speed and being first away from the lights.
driver seat,could be bolts loose or gubbed seat,there easy to get from breakers yards,
steering,get it checked out by garage,may be tie rod or steering joint worn,they will ajust the steering for you,should not be expensive for joint,shop on the net and ebay for your spares and get local garage to put them on,or have a crack at it if you have the right tools.....happy jeepin