Reply to "Rear Ball Joints"

Upper ball joints on either end of any car take far less load than the lowers. In fact, I seldom see worn-out upper ball joints in any car, no matter how abused. So I think your stock setup is fine; they seldom give trouble even in full-on race cars. To make doubly sure, I suggest adding grease fittings ('zerks') to ALL the ball joints plus the tie-rod ends, to vastly prolong their operating life. Not a difficult task, either.