linkage problem

Dan Brewer said

Try moving the reverse lever without the linkage hooked up. If it still doens't fall in you need to re-adjust the side cover assembly.

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The lever moves for reverse. The problem seems to be the shifter. I went through lining them up again, and first through fourth seem good. But no matter how hard I push left, I can't get the shifter to engage reverse. Only first gear.