that's completely correct...
you could seriously screw stuff up.
if two tires are bald and two tires are fresh there is enough of a difference that at highway speeds you could blow the TOD system. As in literally overheat and explode. I've seen it happen to more rugged vehicles than the VX.
it says this in the manual in large print too... all 4 tires MUST be replaced at the same time...
this is hard-fast rule for any AWD/4WD vehicle.
basically when there is a difference in tire sizes between the front and the rear the axles are spinning at different speeds. The problem with a AWD or 4WD vehicle is that they connect in the transfer case so it's paramount that they spin at exactly the same speed.
Where the TOD has an electronically controlled clutch the difference in speed would be enough that the system thinks that the tires are slipping and engages the clutch to try to divert power to the front, at which point it wont help because the wheels ARENT actually slipping and the result is that rather than diverting power to the front you're just burning up the TOD... enough of that at a high enough speed and something WILL break and it will NOT be pleasant.
This will also completely screw up the ABS computer as well.
I cannot stress enough how bad of an idea it is to only replace 2 tires on an AWD vehicle... it is a very very bad idea.
I'm sure you can find people who have done it and didn't have problems, but they should consider themselves lucky.
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