You never can be 100% sure with anything mechanical. I have had installed the IMS Guardian but the ims can still fail. If I had the ln ims installed it could still fail but less likely. I would still keep the Guardian installed even with the ln ims installed.
If my engine failed then I would likely go the second hand route first if I could find one. At my stage of life I do not want to spend $$$ unnecessarily on my Box which I may not keep for more than 2-4 years. Most likely it will not fail. Odds are with me.
Only you can make this decision to replace it or not.....if you want to keep it a long time the ln ims bearing may be the answer for you. Even if you don't keep it a long time you may need the peace of mind of a new ln ims install.
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