Hi Al,
I just came across your post. I have a '62 K10 with the exact same problem. My transfer case is leaking like a sieve, where the speedo cable connects. Mine also exits from the bottom and towards the passengers side. And there's no o-rings whatsoever. I saw that you had a machinist bore a hole (to fit a speedo seal from a turbo 350). Any advice on how to do that? Size/etc?

Thx,
Wayne


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'62 K10 Fleetside