tranny troubles

I'm having a problem with the tranny in my 67 Sprite
It goes into reverse no problem
it goes into 3rd and 4th w/ some effore
it won't go into 1st or 2nd

Ideas?
can I do anything about this w/o having to pull the tranny?
Tommy
61 MGA Resto project
67 Sprite
69 Sprite- parting out , lost of goodies still available

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