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The new body style 99 trucks didn’t have torx, I don’t know how long they went before switching but I think they were in all the full size for a couple years before the change. Originally they had a combination flat blade and #3 Phillips. Problem was the 2 at the lower end, kinda hard to reach and being angled, didn’t take long before the heads were rounded off bad. So what do you do? you have to push down hard as you turn. Doing this helped a lot of people over tighten those screws and split the air box lid at the screw. Gm knew they were selling too many air box lids, and the torx was part of the redesign. They didn’t just start out being dicks about it, they just started out with one of the most often removed fasteners being hard to access.
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