If the spare is at 60 psi, it will be the same diameter as the normal tyres. So it won't make any difference. The only caution is to limit the speed and distance that you drive, for the tyres sake only.
In the VTD version that Danny has, you can't turn off the AWD, you can only lock the center diff into 4WD, so both versions are designed to run the spare without any trouble.
I reckond that the US version would be in more danger of hurting the front diff, by using the fuse, than hurting the Transfer clutch plates.
Harvey.
