Happy New year! Thanks for the link G506, very interesting veriants on these GMC cabs. All good to see . And thanks for the info John 1950, I thought it might be wheel spacers of some kind. so is it that literal, the two different makes of axle have a different wheel hub that makes one stick out more then the other as I think from what I see, the distance between the front wheels seems greater on one from the other? So would that mean say, the bango axle has a wider stance than the timkin?