I do have some PB Blaster but have found it's no better than most all other penetrants. I'll give PB Blaster and acetone & A/T Fluid one more chance . If repair garage can't get it apart today then I'll have to go on the hunt for another driveshaft. "Can buy another new shaft for a mere $799." Wonder if automatics and std shafts are the same without crawling around underneath one of my other Xfires? Somethings gotta give soon because the car has been on jacks, in my driveway, for 2 weeks being difficult removal and waiting on parts.