confusion on frame connectors

[1967coronet]

how about this one . can bolt on or weld right ?

View attachment 1924786

Those are what I put on my 67.
Besides the bolts I did weld each end.
They did help my car, it was a solid car , pan but after 50 plus years they all get fatigued.

 

[dfrazz]

I'd just go with 2x2x3/16" square tubing - cut an opening in the rear frame rail to slide them in and weld and butt weld to the front crossmember. I don't think there's any advantage to welding anything the full length of the floor.

This is what I have done in several of my B and E bodies. Simple, tucks up tight nicely so you cannot see it from a side view, and makes a big difference in solid feel of the car and fitment of doors/glass.

 

[icetech]

I went with Us Cartool on my '62... it was about an hour of grinding them to fit better then welded in... i'm a hack and they were easy enough for me.. and once painted they pretty much look factory..
In the past i have done 2x3 through the floor and it works fine, but was more work and didn't look near as good.
The USCT also stiffened it a ton, before them the car would flex so much that i couldn't open ther doors on jack stands..

 

[threewood]

I bought my car with the square tubing already installed. The USCT look great when welded in and painted. Square tubing looks much easier to do.