i have almost 90k on my 04 lariat screw. i am about to put a 6" fabtech on. would you replace the ball joints and king pins and steering ends? just because..

 

Yes. It seems most members are having to replace ball joints between 40k and 100k. If your ball joints are not worn out, they are almost worn out. Might as well replace the high wear items while you have the front apart as most of the cost involved is labor anyway.