[ERA174]

Make sure you have the proper hardware for the application. If the nuts are nyloc, they will not hold due to the heat generated by the brake and differential. I had nyloc nuts loosen on a cobra with jag rear assembly. I did not experience the noise you have. The rear end became very loose as the nuts backed off. The loose nut may not be the cause of your noise, it is something you need to evaluate and possibly address.