Would have to be someone's homemade version of a coil-sprung 1-ton, because one tons in these years only came in 133" and longer wheelbases, all leaf-sprung. Those frames had straight rails under the bed that didn't accommodate a coil setup. The longest coil-sprung pickups were 127" wheelbase, and the frame rails did a little curvy-curvy thing under the bed to allow for coils. There's more details to that story but I'm betting it's a 127" wb truck with a dually rear (coil perches welded on) and spindles. Either way, unless they went through the trouble of having custom springs made, it would still have the load handling capabilities of a 3/4 ton, because GM never made rear coils rated for 1-ton pickups.
I'm sure longhonrmail was not saying that you didn't know what you're talking about, but instead was saying that whoever might be claiming to have one didn't know what they were talking about.
