99xcss4
92g-94c frank'n (truburban) K-2500
if I was in your shoes this is what I would do if the K-3500 is good and dose not look like it belongs in the junk/scrap yard I would cut both frame just after the t-bar cross member and then weld and bolt one frame back together
I have to ask though you want a crew cab truck in that 97 K-3500 why swap the cab on to a 1500 that is a huge down grade imho 1500s have $#!+ brakes and you will not be able to tow/haul as much as the 3500 can and a note for any one that has plans to cut a frame I am all most 100% that from the front bumper mounting spots on the frame to the back of the t-bar cross member regardless of wheel base is the same length
if you are wanting a short bed because that is the reason I could see some one doing as much as I am against butchering long beds into short beds that would be a option or you can on the hunt for a 99-00 gmt400 crew cab short bed they are pretty rare though from my understanding good luck with what ever you decide to do I have grafted one of these frame once cut the front have out of a 92 K-2500 suburban and cut off the front half of a 94 C-2500 extended cab long bed grafted the the front half of the K2500 suburban frame on the the rear half of the C2500 frame
I have to ask though you want a crew cab truck in that 97 K-3500 why swap the cab on to a 1500 that is a huge down grade imho 1500s have $#!+ brakes and you will not be able to tow/haul as much as the 3500 can and a note for any one that has plans to cut a frame I am all most 100% that from the front bumper mounting spots on the frame to the back of the t-bar cross member regardless of wheel base is the same length
if you are wanting a short bed because that is the reason I could see some one doing as much as I am against butchering long beds into short beds that would be a option or you can on the hunt for a 99-00 gmt400 crew cab short bed they are pretty rare though from my understanding good luck with what ever you decide to do I have grafted one of these frame once cut the front have out of a 92 K-2500 suburban and cut off the front half of a 94 C-2500 extended cab long bed grafted the the front half of the K2500 suburban frame on the the rear half of the C2500 frame