Based on all research and feedback, now looking at the following tires for my offset 87s:

General Tire Grabber UHP -

Front 275/45 R20, 29.7" diameter
Rear 295/45 R20, 30.5" diameter

Will these .8" larger diameter rear tires place any inappropriate stress on my Mechanical transfer case (NV 125)?

It seems to me the transfer case must be designed to accommodate slightly different rolling diameters front to rear. Is this not true?

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