1994 s-10 blazer won't downshift

I recently changed the trans filter and fluid. The old fluid looked pretty clean. Now I don't have first gear. Any ideas???

I also forgot to mention... When I floor it, there is no kickdown.

I recently changed the trans filter and fluid. The old fluid looked pretty clean. Now I don't have first gear. Any ideas???

This is likely a problem with the wire harnesss running to the transmission. I may have been pinched or disconnected.