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Originally Posted by JCL
...I do think that a constant speed difference between front and rear contributes to transfer case wear.
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Wear to the planetary gears, yes, quite possibly, but that's a different matter.
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Originally Posted by JCL
BMW techs on the board have commented that they have seen damage to transfer cases from tire size differentials.
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Commonality is not causality
These propshaft splines are known to fail anyway, how anyone can claim it's definitely due to tyre size in some cases, but not in others I don't really know. From an engineering point of view, a small difference in tyre size front-rear will have absolutely no significant effect on the loading on this spline. IMO far more likely is a different connection - that the kind of person who fits huge blingy wheels is probably the same kind of person who drives their car hard, doing full-bore launches more often.
That will shorten the drivetrain's lifespan a lot more quickly than having slightly different tyre sizes !
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Originally Posted by JCL
I have personally only seen DSC errors due to the difference in rotational speeds.
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Same here.