You can replace the selector rod if its sloppy - there are 2 bushings if I recall correctly that go on the factory selector rod which are like $4 each - However, you should hope that your shifter pin holding the selector rod in place on top of the trans isn't seized like mine was - the "jesus clip" if you will, mine was easily rotated but was frozen in place, I could not get it out for the life of me, and there isn't any room on top of the trans to hammer it out either - So I did the entire UUC install from under the car and in the cabin, its definitely doable.

Someday I will get my selector rod out, just not on the list of priorities, I still have the new bushings in my toolbox and a new jesus clip.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards