My lower ball joint on the driver side is almost toast. And the passenger upper ball joint is all most shot also. I was going to replace both upper and lower ball joints on both sides. How hard is it to do this. I've torn apart the front end before but never replaced the ball joints. Also are there any parts that are better than others or after market parts. I believe they can be purchaced with zerc fittings but is there anything stronger or better out there. Any info or thoughts would be greatly appreciated! Thanks! 410 Where you at???