Will a front automatic hub from 2001 Xterra fit on my 2000?
No, the front automatic hub from a 2001 Xterra will not fit on your 2000 Xterra. The bolt patterns are different between the two models, so the hubs will not be able to be mounted properly. Additionally, the axle splines are a different size, so the hubs will not be able to engage with them. You will need to find a front automatic hub that is specifically designed for your 2000 Xterra.