Well they worked. I extended 2 pairs of cheapies Amazon vise grips and they reach all the way to the bottom of the cab wall. They did twist occasionally and I had to reset them, but they did the job. Probably a once in a lifetime need, the only reason I went "cheap" on them and took a chance. Pix of how they started out, a set of "vise grip" model "24r" and my modified grips.
With a solid 3/4" thick copper bar clamped to the bed wall it went pretty well. I have to go get more 75/25 gas for the mig to finish the driver side vertical seam
I did have one problem. I noticed right away once I had the Bondo ground off that the bottom and sides didn't touch very well, and I tried to make a go of it but it backfired.
PLEASE GET RID OF TIK TOK ADS. THIS IS BEYOND RIDICULOUS I shouldn't have to stop posting 4 times in the course of 1 sentence to delete the damn ad that COVERS THE SCREEN
I had to backtrack and grind out the welds that were working and put a block of deck board in between the old lip and the replacement panel and between a scraper, bottle torch and a wire wheel I had to get rid of 2 layers of original seam sealer... That which Dodge put on the back cab wall/floor pan junction on both this cab and the one that the "hack" (whoever that was/ half azzedly installed in this cab. Funny once that crap was outta the way how much better things fit up. There was a good 1/8" gap between the overlap between new and old that they tried to compensate with by loading it up with pop rivets. There was a section of Bondo missing along the bottom, where the roughly cut original lip of the cab had a gap about 7" long towards the passenger side of the bottom
No more gap now....
I also skip welded the overlap "flap" on the inside, pass side vertical seam.
The welder did "ball up" on me once, had what they call a "bird nest" by the feed rolls. Once I got that untangled and fed again it mostly went great, although it would occasionally pop and fart instead of the "sizzling bacon" sound you want while MIG welding. Then run fine for a while.
This machine I have is like a "bull in a china shop" as being all the way turned down on power setting 1 and feed barely off the Lowest possible setting sometimes it wanted to burn holes. I thought about finding a 110 powered machine just for this job. Got better with the copper backer in that sense.