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Originally Posted by 78SilveradoSWB
I believe the gas doors were in the very late 78 model year switch over to the 79 model year. My truck also has no Cats either.  |
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.
Other diffs:
73-74 had a center latch on the grille and also hd a unique grille that can no longer be had aftermarket.
73-80 wiper arms were "covered", as 81-87(91) were exposed.
73 was the only year that DIDN'T have drip rails.
73-79 frames had solid frame crossmembers, 80-87 had "lightened" frame crossmembers with holes in them.
73-80 vent window assemblies were "longer" (went to the top of the door frame) 81-87(91) were short.
73-76 no power, 77-up power.