I got a blue miyata off of ebay a little while ago. I have been having difficulties ajusting to it because from the bottom of the frame to the top of the wheel is 3 in. On my old torker it is only a little under 1 1/4 in in the the same spot. Are all miyatas like that or is it the wrong frame?
Mark 
also would this make stand up wheel walk impossible?
Yes.
Not impossible, but very difficult. I suggest you get a new frame.
you sure you don’t have a 20" wheel in a 24" frame?
that’s what I was thinkin…I bet it’s a 24" frame.
Many years ago, all 20" and 24" unicycles came with the same size frame. I turned my first uni, an original 20" Miyata, into a racing 24".