Mahara, 1992 Sierra 1500 starter replacement not a bad job to do a little tight. Link below will show what is involved in replacing starter. As far as the smoke you saw, may have been starting circuit wires that overheated from bad starter, remove wrapping on wire bundle and check wires for burnt/damage and make necessary repairs.Good luck.
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https://www.youtube.com/watch?v=XvfI9XsIMSg