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D13 · 11-09-2016, 07:08 AM

Under bumper air deflectors were factory on the 81 up, they were designed to block air from going under the truck and divert it around the sides to reduce drag. There was no factory components available for 77-80.
The more forward more square ones we used to call curb finders LOL. TO the best of my knowledge those are aftermarket, and any of them that actually mount fog lamps are aftermarket. Not sure if anyone still makes them.

11-09-2016, 07:08 AM	#15
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: Air Dam/Deflector Under bumper air deflectors were factory on the 81 up, they were designed to block air from going under the truck and divert it around the sides to reduce drag. There was no factory components available for 77-80. The more forward more square ones we used to call curb finders LOL. TO the best of my knowledge those are aftermarket, and any of them that actually mount fog lamps are aftermarket. Not sure if anyone still makes them. __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors