I have this 1966 Chrysler New Yorker with perfect rear rails and very nice trunk floor and probably lots of other rust free parts you could use. I am located 13 miles from the Oklahoma - Arkansas border and right on I-40. I was going to sell this car to a demo derby guy but if you could use the parts you can have what is there for 250. I am super busy with my business so I have no time to remove or ship big parts so you would need to arrange pickup. PM me for my number if interested.
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This most generous offer I can't take, simply because of logistics. Pity too, as there are indeed QUITE a few good looking bits visible in the pics you've posted, but I haven't the means to get to the Ak/Ok border on I-40 for now.
Having now poked extensively over my frame rails with a sharp, hard metal punch and hammer, I found the rest of the frame sheet metal to be quite sound, except the corner of the rear crossmember and the first 24" up the driver side frame rail. Having tapped out plenty of dried mud from that rusted out section, I now believe it must have laid for some time w that corner in contact with earth, front slightly down-slope to pick up ground run-off water. The floor-pan is good and solid just above this mess though, as is the forward portion of the rail beyond the critical back 24" from the cross-member to the first upward bend, at the big bracket facing out to the side bolted into the floor pan.
The 5" width at the back, which tapers down gradually while the height of the rail increases permits a nice bit of reinforcing square tube to be inserted into the rail, which then can be joined to it by some 1/2"x13 all-thread, several bolts through the top, and a little welding at the back as well as another 1/2"x13 bolt to secure the crossmember to the square tube, using a big nut welded in place on the back side of the cross-member, already present. The square tube consists of 3/16" sheet, which is thicker than the original 14 gauge sheet of the rail.
Sooooo, I believe I can and will contrive this "splint" for the near-term future, and see what can be acquired for a more elegant, permantn fix to be effected when the engine is replaced. (That not being necessary for some time I hope.)
Ergo, if you need to be rid of that NY'er, don't hold it for me. My wife and I both thank you for your thoughtful, generous offer all the same.
Gerald Morris