Come to think of it i had a 89 chevy pickup 2500 series 4x4 back bout 10 years ago that was 6 lug. pretty sure it was a 14bolt that gm used but not positive. think they only did the 6 lug 3/4ton for 1-2 years.
Yes GM did use the 14boltsf in 1/2ton and 3/4ton trucks from 88-98. In the more "heavy duty" 1/2 tons they came with the 6 lug 14bsf and the lighter duty 3/4 tons also can with the 6 lug 14bsf. The heavier duty 3/4 tons came with the 8 lug 14bsf and also the 1 tons came with either the 14bsf or 14bff both 8 lug.