Welcome to the Barn and to the C2 family.
I've never seen any American made vintage 4-speed manual transmission that had a dipstick. Certainly I've never seen one on a T-10.
Can you post photos of the transmission and this mysterious tube? I can only guess that somebody added a vent to the case, or modified this transmission for use in some vehicle in which it might have previously been installed, and that prevented access to its drain and fill plugs.
The T-10 was installed in early '63 Corvettes. There were several hundred running changes in production during the model year, one of which was the switch to the Muncie transmission instead of the T-10. What is the VIN of your '63? Is there any chance that the WH81-2 that you reported is actually WH31-2?
Live well,
SJW
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