Help please with bent front shackles

[+GOAT+]

Very new here. I just joined. Hello to all. I need some help please. Search isn't working for me.
I have a 1987 gmc 4x4. My truck has been dog tracking. Not much but enough to notice. I found my front /rear shackles are bent towards the pass side. The pass side tire sticks out bout 1" maybe 2. I just ordered some new shackles. The questions are will this fix the problem? Do I need to loosen up anything to get the diff moved back over towards the driver's side? If I put the shackles on , will a alignment fix it? Any help will be great.