slipping out of third when downshifting.

xaftermath801x

New member
i finally got my car up and running and it seemed to shift great then out of nowhere when id downshift from 4th to 3rd it would not stay in third gear and grind when i tried to keep it in. it goes into gear find when shifting from 2nd gear to 3rd and stays in place. any idea why this is happening?
 
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