On the 22's, there is no difference between the 250 Tremor and the 350 Tremor, other than that F-badge and the weight rating sticker. In some states, apparently the 350 is more expensive to register, but that's not the case in WA. I wanted the max capacity sticker, so I got the 350 Tremor. If you are not talking about the 350 Tremor, then the 350 has higher payload capacity than the 250 Tremor, and an number of other suspension and wheel differences, as well as engine and axle ratio options.