Tire help

[Baby Lee]

Originally Posted by BossChief

I had them hold off on putting them on and figured I'd ask you guys if that's a legit concern (the truck is 4wd).

The more sophisticated your system, the more important that specs are adhered to. This is particularly true with tire sizes and AWD/4WD. The transmission/transaxle is rotating at a certain speed, distributing power to the wheels. It's doing so expecting that each rotation will propel each tire a certain distance. If your tires are different sizes, they travel slightly different distances per revolution. If there's no slip feedback, that difference has to be absorbed by the system by either dragging the smaller tires a little bit to keep up with the bigger ones, or stressing the transmission/transaxle when each tire's distance to revolution ratio is different.

If you value your transmission, and do a lot of highway driving [where the differential builds up because the system can't correct like it could slipping on gravel or dirt or coming off the ground, I'd match the tires.