Back in the 80's it was common to have radials on the drive axle and bias on the steering axle. In fact I did that on my fleet until I figured out that putting radials on the steering required different alignment specs. I still prefer bias on my 350, 450, 550 and 600 series GMC. They were built for bias, and the stiffer sidewalls on the bias don't follow the ruts in the road like radials. Having a mix on the same axle is a violation of federal law in the US.
