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I'm thinking of going from my 275/70/18 tires up to 285/75/18 size. I'm sure that I'll have to have my speedometer reset, but my real concern is if I have to put the original size spare tire on in an emergency...will this mess anything up in the drive train?!
I wouldn't. The tires are close to the same size. The front differential is open. Not seeing a problem here.
Tires are 8.4% larger... I like to play it safe. You can't make a tight turn in 4wd with both hubs locked. That tells me I would not want to drive a long distance with one tire larger than the other.
Just my opinion... in an emergency I'd drive in 4wd and take my chances no doubt.