I was going to do a transmission fluid and filter change today so I put the truck up on ramps and slid underneath. I took the first 3 bolts out with a bit of trouble because the heads were rusted but the 4th rounded off. After a few choice words I slid out and got my sets of extractors. The first one I tried was an 8mm spline type but it got no bite so I pulled out the flank bite sockets and it rounded worse. I did not let it go all the way over because I could tell it was not going to work so I finally ended up with the reverse twist lock type and that made a perfect round head. I skipped the to rest of the bolts and every single one was rusted and rounding so I just hammered the twist style on and got all of them off but 1 more. I went back and replaced all the bolts with new ones as I worked on the 2 that would not budge. As you might expect I made a mess of 1. I tried cutting a slot in the head for an impact driver and it just made a security screw out of it. You know the kind with a ramp. Then I ground 2 flats on it but I could not get an open end wrench in because of the pan on one side and a flange on the other so I tried clamping vise grips on it nose up and and as expected they just slid around and bugger everything up. Then I ground the head flat and center punched it and tried a left hand drill bit but that did not work and started moving off center so I got the ez outs in the hole and it tore the head off but left the bolt in the hole. I have 1 more to try and get out and thought I would ask if anyone has any ideas that I did not already try on the first. I cant put a torch in there but I did put a big 150 watt soldering iron on the head of the first to get it warmed up, I did not try penetrating oil because the bolts already had a coating of transmission fluid on them from the crap job the dealer did when they changed it last time. They pushed Black permatex into all the threads which is why I think I am having so much trouble. I found a set of reverse biting sockets on Amazon for removing studs and it has 7, 7.2, 7.5 and 7.8 mm but it costs $79. I may just order them. It wont stop me from having to finish drill and plug the first hole but maybe they will get the 2nd one out.