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That is a very smart question, especially for a non car person.

The answer is that it does not need to move back and forth. As proof: the transfer case output flange (the triangle shaped flange) has a set of shims designed to keep it affixed as tightly as possible to the shaft. However, it isn't enough to keep it from micro movements clockwise/counterclockwise. The purpose of the loctite 660 is to cancel out those micro movements before they wear out the metal splines.

Yes, high heat can soften the loctite to be able to remove the flange.


Would you really need to remove the flange often? Very doubtful, except for a very thorough rebuild, which assumes that the rebuilder will have the skills to do it anyways.