Replacing the original front driveshaft on 2000 TJ. Started out as a double cardan cv joint replacement. 2 of the 4 bolts that attach the driveshaft to the transfer case are seized. Been soaking it with PB Blaster for 2 days. Bolts are rounding off. Used a rounded bolt extractor socket, not budging. Need ideas to get these bolts out. I’ve purchased new bolts to replace.