Dustin0408

Hi everyone, I have a manual 2011 mustang gt with 6000 miles on it and I currently have 3.31's installed. I recently purchased ford racing 3.73's and It came with pinion, gear, crush ring, shims, and pinion nut. I was just curious if I need to change the bearings or seals or anything else. Also I plan on putting 75w140 royal purple in it and I was wondering if I should still put the ford friction modifier in it, and if so how much? Thank you for your help.