Diesels are typically heavier, which would require stronger frames, and typically stiffer springs to make the truck ride level.
I'm sure an kit that fits a 3500 (1 ton) will work.
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1985 GMC K1500 long bed, 6.5 TD W/ NV4500, NP208
1991 GMC K2500 6.2L NA W/ 4L80E