i was wondering, i'm going to run a turbo soon. Just about 5 pounds, i was wondering if my stock axle was going to break soon enough? (stock ls)

 

no..You should be fine with just 5psi.. I know a guys run 20psi on stock ls axles and still hold up.. I dont reccomended though, but just 5psi, you all good to go.. more than 8lbs i should looking into suspension upgrade...