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Quote:
Originally Posted by Ross F-1
Factory overloads were only on F-4's and larger.
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As with many variances in Ford production it was possible to order overload springs from the factory as an option on both the 3/4 and 1 ton trucks. My 1940 Tonner is an example of this. It came from the factory with 14 leaf main springs and 7 leaf overload springs. It also had 7.50 - 17 8 ply tires which enabled the owner to register the truck as 10,000 GVW here in the state of WA. The purpose of the overloads as stated in the 1940 Ford Reference Manual was “Auxiliary springs provide reserve capacity for the heavy loads, thus making it possible to have sufficient flexibility in the main springs to produce good riding for the lighter loads and when truck is empty.”
Its hard to tell from the photos but if the brackets on the frame that come in contact with the overload springs are riveted to the frame I would bet that they are OEM and not after market.