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Originally Posted by Captkaos
You both would be correct on the gas door. It "officially" started on '79 for the pickups, but it started in '78 on the blazer/burbs. As for Cats, I had a '75 that had them. Cats were determined mainly by the GVWR of the Truck.
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So far everyone has said 78-79 for the gas doors, but I own a 76 that has dual tanks with gas doors on either side and not the screw on caps in the fenders. Was my grandfathers before that and he bought it factory brand new.