Yep, got a Trail Tailor diff drop installed. Freak accident or went a little too aggressive somewhere? It's the diff side boot so it will be easy to replace. Maybe just give the OE boot another shot?
I also have 2inch lift without a diffdrop. Leaked grease soon after the lift. Then a mechanic did one side and I did the other by myself. Both holding well over 10-15k miles, not much offered/flexing though. May be yours overtightened, that can easily happen with aftermarket tighteners