Be carefull with thrust bearings guys. If they get dirty or if you set them too tight they will still be smooth but they can make you car push.

I have been racing on road on asphalt parking lots for 22 years and I only need to replace my right hub bearing once per year. I dont use anything special either...just BMI/Boca stainless bearings, steel balls (not ceramic, or tungsten), and IRS D rings sanded on 600 grit wet dry paper.

My diffs are always glass smooth, spin super free and will not slip at all.