i can only imagine whats going on in the internals. when I had my '99 hoe, one winter I got a flat and put the spare (245) on, not even thinking that the other 3 I had on were 265s. The noises that my transfer case and front diff made...horrible, especially in 4x4. These things are extremely sensitive to different diameters, I mean you gotta figure, despite the clutchpacks, its all locked together...somethings going to give and its certainly not going to be a wheel and tire, if you catch my drift