someotherguy
+1y
Back to the question of what it started life as, now that the original cab is gone from the frame it will be hard to tell. If it was still the original cab you could go by the 4th digit of the VIN, G would typically be what you see on a single wheel one ton (and also regular 3/4 ton, but VIN 6th digit would help decode that further, 2 for 3/4 ton, 3 for 1 ton) for 8000-9000 GVWR, H would be 9000-10000 GVWR and be a dually. Your truck is titled as a '99 due to the VIN on the cab, regardless of what frame is under it, the only time anybody might check is if for some reason it gets impounded as suspected stolen and they crawl up your ass with a microscope and want to know why the VIN's don't match...very unlikely, esp since your '99 title is free and clear.
If you can trace the owners back enough steps to when the '93 cab was still on it then the VIN would clear all that up. Mostly I figured I'd post this in case others were in the same situation of trying to figure out what the original rear end setup was.
Richard