I have a chance to get a great deal on a 75 chevy 3/4 4x4 with rear 14bff and front dana 60, new 38" tsl bias ply, and new motor/trans. I was wondering if anyone has added a 4th seat belt to a standard cab truck? I have 3 small kids which physically would fit with no trouble, and would like to add the 4th belt for trips to school etc.
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I would just engineer it to withstand the 50-100# of your target kid at speed -- doesn't matter if it's legal or not as long as it saves them from being tossed from the truck in a collision.