I started making a new crossmember for the tranny/suspension.
So obviously I'm not going to attach it with just the two bolts per side as was done in an XJ application. The Comanche is actually a bit different in it has brackets on the inside of the frame that allow for more attachment points. Those brackets won't fit anything I'm going but there is more attachment points.
I plan to use the following locations below:
Conveniently I have a viewing window where the floor was on the driver's side. The three captive nuts on the bottom of the frame rail are stock crossmember mount locations because there is two places it can go. I think I'll drill these out to 7/16 as the threads are pretty bad in them as it is, they're M10x1.5 right now. On the side of the frame there is two pairs of M10x1.5 captive nuts, I think I'll leave them as M10 and pick up on them. The holes through the top flange also had M10x1.5 studs in them originally, they obviously disintegrated with the floor, and I plan to put a strap between these (along with the two layers of metal that make up the floor and the hat channel of the frame) and weld in some 7/16 UNC bolts.
Too me this seems like enough places to attach and spread the load from the tranny/3 link crossmember, but I'm open to input. On this side it's easy to add more captive nuts, I have a lot of access right now.
The other side might not need the floor cut open entirely, but it's not in great shape (the hat channel has to come up at least), so it's not the end of the world if I should cut it open and add a few more.
Also, the rust in the frame looks way worse in the pic than it is. Parts of the floor are still stuck to it, and there is rust powder on clean metal. The frame itself is fine, well, it needs a little cleanup, but it is structurally fine.
Thoughts?