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In '87, GM changed the "old body" style designation to "R and V" series instead of C and K. These letters ran up to '91 which was the final year for these "old bodies".
The '88 and newer body styles retained the C and K monikers.
If you check the title or VIN off that '89, you will find a "V3" in there which will tell its a 4x4 1 ton.