Denny, I know of 2 guys that found 4.10 gears at places I had overlooked within 50 miles of where I live. I think the customers didn't spec pickups back then, but the dealer did. Apparently the Chev dealer here must have ordered several of them. Most pickups of that vintage died within 100 miles of where they were first sold. I haven't been looking very hard because I plan on putting a Saginaw OD in my 3/4 ton. My cousin's parts man found 3.90 in the parts book for limited applications, but I don't think I have ever seen one that actually existed.
