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If doing the clutch, by all means upgrade the IMSB. It's a lot of effort and labor to drop the trans, so best to do both. I just got my 04 S back from doing same at 60k mi. Single row bearing and it was intact, but felt "wobbly". My mechanic said it was indicative of wear. Replaced with the LN kit. While it's not the final solution, I'm confident I can go many thousands of miles without worrying about the IMSB. There are other engine failure modes of course, but I feel like I've reduced the risk profile considerably. peace of mind was worth a lot to me.
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