What do you mean it fit? The inner tie rod should not be able to turn in or out due to the metal washer that has a tang on it is bent forward (outboard towards the hub) around the inner tie rod.

Performing the removal/assembly should basically be this:
-remove all outer related parts
-use a punch or flathead to gently bent the tabs of the washer inboard.
-unthread and remove inner tie rod
-remove washer if new tie rod came with new washer
-slide on new washer
-thread on new inner tie rod and torque down
-(sometimes tricky due to space constraints) bend washer @2 places outboard over the tie rod.
-reinstall related parts and perform alignment

I am not a fan of reusing parts, especially simple things like a lock washer, but if your new chassis part did not come with it you have no other choice.

I do not mean to be redundant, but if you were able to remove the old tie rod without manipulating the lock washer, then the washer was not doing its job. And your new inner tie rod will back out eventually if it was not installed correctly.

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2012 2500HD LML