You have an 05 so you have the x-drive transfer case. It has "tire tolerance logic" and when it sees slight difference in wheel diameters it lets some pressure off of the clutches to prevent premature clutch failure in the t-case. Of course I wouldn't recommend it for very long, and not if there is a big difference... but for a slight difference for a short period of time it will be fine.

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X5 pics

RIP 4.6is.....

2003 4.6is