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AF Tcon means that it will support Auto focus when the camera is able to.
However you have a more significant issue when trying to pair this lens with a teleconverter, and that is that it simply isn't compatible (according to the WEx site). Not all lenses are unfortunately.
The Tamron is something of a bargain basement lens and if you have some spare cash it might be better to think about a 70 - 200 f/2.8 Sigma or a 100 - 300mm f/4 second user. You will get far better results than with the Tamron.
Even if it were possible to use this lens with a TC I think trying to use it as a 140 - 600mm would be a nightmare. Long lenses are very unforgiving as the depth of field becomes very limited, and shutter speeds need to be quite fast, hand holding in all but the brightest light will be out of the question. Your widest aperture will be f/11 which is anything but fast, you might be able to use it for images of the moon, but anything which moves will be impossible.
My advice is to seriously consider changing this lens to something more suitable, another cheap way would be the Sigma 50 - 500mm which again isn't tremendously fast, but it's much better than what you are thinking of.
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