The shift box is a very simple device- - - -just two lever arms with slots in them, and a round torque tube with tabs that engage the slots in the shift arms. Four screws hold the box together. While you've got it apart realigning everything, check for wear, and draw file the upper housing if necessary to eliminate any vertical slop. The diecast housing has a bad habit of wearing egg shaped and creating sloppy linkage movement.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!