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Thanks everyone for your input and information; here's an epilogue: I had a transmission shop do a rebuild, and this a paraphrasing of their diagnosis. The shift fork and collar for 5th gear were damaged when the gear was engaged at high speed, due to excessive movement of the tail end of the transmission, leading to the collar getting pushed too far and getting stuck. The (badly dry-rotted) transmission mount at the rear of the trans was implicated in the trans failure, there was excessive play and the shifter was very sloppy, wagging like a dog's tail at speed. The driveshaft yoke was also damaged, and I ended up replacing it when I had the trans rebuilt. The sad thing was I had a new trans mount on order when this all happened, because I was going to install it along with a short shifter kit. Does this explanation jibe with your experiences with S chassis transmissions? It makes sense to me, though I'm surprised that it was possible to break a trans this way.
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