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Unless the 2500 used a different radiator than the 3500, I'm pretty sure it was a 3-core. My Delphi replacement is definitely a 3-core. It came from the Harrison Radiator plant in Lockport, NY. Wide 2-cores are what companies are doing now.
Just ordered on for a 2500, it was a 2 3/16" thick 2 core 19x34. I looked up the 3500 as well and it was the same radiator.
I thought you could get the 350 trucks with a FF rear...maybe that is only in the 3500's. There are so many combinations on these trucks its hard to keep track.
From what I've seen, the 2500 got a taller radiator than the 1500 and the 3500 got the same 19" tall unit as the 2500 but a lot thicker. I think all diesels got the huge radiator no matter what. I tow around 9000 enclosed with my modified 1500. I imagine a real 2500 would be that much better with the added weight of a longbed and rigidity of the thicker frame. It'll tow more than 7500 safely. My owner's manual has the 2500 rated to tow less than the 1500, so GM's logic here is simply not to be trusted.