If you have a automatic transmission, Then you have a mechanical transmission failure, for a 1993 K1500 you can get one at a salvage yard, For a 1993 front transmission pump failes easy
You may have to check the valve for the transmission. Each of the gears has valves which sends the fluid to engage the gear. It may need cleaning or is faulty. Normally this happens when you have debris or dirt in your oil.
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