There is a small amount of thread locker already applied to the Jowl Split Shackle pin threads so adding additonal thread locker is only required if you would like a more permanent hold or if you have unmounted and mounted your shackle enough times that the thread locker is not functioning any longer. We recommend Permatex Purple thread locker for an easily removable hold or Permatex Orange thread locker for a medium removable hold.
If you are looking for a more permanent non-removable hold solution then use blue or red thread locker. (Please Note: You will need to heat blue or red thread locker to remove the cap screws from the pin and the heating process can damage the powder coating on the shackle or the coating on your bumper or shackle mount.)