Two days ago I removed my driver side trailing arm for restoration and to finally install my D/S Toby Tab I bought about 15 years ago. The bolt is incredibly stuck in the T/A so it's currently soaking in ATF+acetone. I might have to bring it to a machine shop to get the bolt out. We'll see.
Last night I removed my P/S trailing arm which already had a Toby Tab installed. I was shocked to find the locknut was fairly easy to turn off of the bolt - I need to check this stuff more often. The arm was not loose but certainly could have been eventually. I will probably double-nut it on reinstallation.
Anyway, the nut came off, bolt slid out, got the arm out of the way. Now to remove the T/A bracket because I'm replacing all this stuff. The rear 13mm bolt/nut came out OK. Note: the hole in the frame is also threaded, it is NOT a hollow tube!!).
The front was a lot tighter. For some reason I had a really tough time getting a wrench onto the nut, probably due to clearance issues with the frame sticking out (the part where it's slightly bent) as well as the shift levers. I thought maybe the locknut was stuck onto the welded nut so I put a ratchet on the bolt head and it actually unscrewed a few times before the head snapped off , leaving about 1/4" of shank remaining, frozen in the frame. Things got very scary as I slowly ran out of options to move the nut due to extremely poor access. I briefly considered cutting a hole in the frame so I could get a socket on the nut, squared-up, but finally gave it one last shot with a stubby 13mm (I almost never use stubbys, but damn, when you need them... YOU NEED THEM) coming from the outside/ TA side of the frame, with another wrench linked to it for extra leverage. Now the nut was moving and turning the shank out, but the shank was too long to get the nut and shank out of the frame. I ended up using my angle grinder to cut the shank off flush with the frame (about 2mm of clearance to spare to get the grinder in at the right angle), then that gave me just enough room to turn the nut and shank out. Wow - could have been another crisis. This took all evening but I was relieved to get it out - popped a beer in celebration (Boulevard Coffee stout)
On the plus side, now I have removed every single bolt that touches the frame except for the engine mounts so HOPEFULLY no more broken bolt bullshit in the future...... RIGHT?!?