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I could have swore I've seen the toothed wheel on a 90 or 91 before.
Now that you mention it though, I know you're right about the VSS working as the wheel speed sensor on some models. I don't doubt that part a bit. I'm just trying for the life of me to remember what truck it seems like I seen the toothed wheel. I probably smoked some crack or some **** and didn't know it.My '90 didn't have one and I don't remember seeing others. S10's and Vans had the same rear ABS setup, and there weren't speed sensors on those axles either.
Now that you mention it though, I know you're right about the VSS working as the wheel speed sensor on some models. I don't doubt that part a bit. I'm just trying for the life of me to remember what truck it seems like I seen the toothed wheel. I probably smoked some crack or some **** and didn't know it.