Fast Question!

Make sure you use a 6 point socket to lessen the stripping chances slightly. Soaking them in wd-40 or PB blast will help, but let them soak for a few hours.

I would use a breaker bar before I attempted an impact, or if you did use an impact don't go full out on it... feather it some so you will lessen the chance of stripping it out..
 
I:II am just giving you a hard time!I:I It is just info for eveybody else and it's good to have people on the forum that can figgure things out on their own.
 
when they are stripped and stud has to be replace i just notch a groove in the nut with an airchizzel and work it in the left motion. u will eith cut through but more than likely it will back off