O.K.
Block your wheels.Crawl under the truck and disconnect the linkages at the tranny.Find the center position for each arm coming off the tranny.They will have three positions each.Once you have the arms set to center(tranny is in neutral), make sure the shifter is in Neutral position.Get the linkage rods in position so they will attach to the arms coming off the tranny without pulling on the rods or moving the shifter.
Secure the clamps which hold the linkage rods to the arms.
This SHOULD solve your problem cool .If not, there may be problems with the shifter assembly itself frown

There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!