what is the problem with discount and some of these tire joints these days.

69_340_GTS said
There is a reason cars (and that includes AWD cars) have one or more differentials: To keep stuff from wearing out or "burning up" due to driving around corners, or just driving on uneven surfaces. Front and rear axles are never normally locked together on AWD vehicles. There is a cnter differential. Because of this, minor differences in tire diameters shouldn't matter.

But with the advent of all the computer controls, the computers are now reading wheel speeds and it can confuse them. If it is enough, it can cause the brakes to grab, or the transfer case to lock because the computer sees it as wheel slip. And with everything having ABS anymore, I'm not sure the issue is just isolated to AWD/4WD vehicles anymore.