There is one point of wear/adjustment on an a/t linkage. It is the only "joint" underneath the truck I can recall, and it can generate some slop and thus binding. The only real adjustment affects the relationship of what gear the transmission is in and what the indicator shows in the cab. I've had them out enough that the shifter wont drop all the way into park or will hit park fine but won't go into L1. At the point of adjustment, there are shims/bushings/spacers that allow the joint to operate..if they are worn, the shifter could bind up when it hits odd angles. May or may not actually be the problem.
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