Teacherjkm,
Whitetiger is right on point, first lube all the pivot points as any bind in it will cause it to not engage properly.
it's a spring loaded engagement, that is to say you pull the lever and a pivot point and spring come into play, this allows the shift collar to slide in when the timing of the gears is correct.
There is no adjustment on the linkage, if you still have issues after lubing it up , check the linkage for bends that are not factory.
GWD,
Please, step back and take a break, your getting hostile and heated for no reason!
Dave_eng, Tx Jim, Whitetiger and I were trying to Clarify for you and Teacherjkm that the system is mechanical and not electrical.
Should have posted this earlier: DT lever