Ok, So I took my rear end out a while ago, and when I went to replace the endlinks I stupidly took the mounting plate out, now the problem is, I can only tighten up the one nut, and on the other side its a bolt which I cant tighten because the nut is inside the frame rail? Can I access this from inside the car, or what the heck do I do?

 

ok whenI did my end links on the rear the same thing happened you just need to but a nut that will lock to hold that plate on when i removed mine the nut and bolt came out together on one side and teh other just the nut cvame off.

Easy fix

 

So you are saying the captured nut inside the frame rail is turning? That sucks. About your only option is to drill through the nut and frame rail and use a long through bolt, or screw a stud as far as you can into the captured nut and then weld both to the frame rail.

There is no access from inside, I haven't looked to see if there is a body plug in the frame rail that might give you access.