3 on my tree shifter too loose

Have somebody sit in the seat, while you look at the linkage, most likely the bushings where the rods hook to the trans or column linkage is wore out.
Take it apart and have custom brass bushings turned down.
I had to drill the attachment points for the rods to a larger size, and weld the rods in a couple of places to fix the wear in them.
Cost me about $20 to fix it.
Shifted really nice afterwards.