IHPWR - It's called the "lower splash shield" by LMC in their web ad. The Chevy Master Parts Books call it the "lower baffle". Fits behind the grille along bottom of front fenders and directly in front/below the radiator support.

Below is an exploded view of the AD series Big Bolt truck showing the "lower baffle", which is the same design as the 1/2 to 1 Ton design, just a larger part for the bigger trucks The parts book shows they do not share the same part number.
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)