Installing New Brake Rotors on GMC Vandura 2500 Van, I have seen/heard 3 opinions on changing the wheel bearings; 1. Inspect the old bearings, THESE WERE MADE TO BE "SERVICEABLE," so if they look ok, clean them with gas, clean the spindle, repack them, lube spindle, re-install them and use old seals, use them again. 2. Do not clean them with gas, never re-use the seals (That last one makes sense to me). 3. Bearing are factory matched to races and CANNOT be interchanged EVER ! (That last one seems to make sense to me as a former machinist, but then again these are TAPPERED bearings wer are talking about, so perhaps the crucial point, given that everything SHOULD be at the same manufactured angles( IS IT ??? ), is tighness of castleated nut) Knock out the old races, press/knock in with similar size socket, new races into rotors, install new clean well packed bearings, do NOT interchange races and bearings as these are always factory matched to close tolerances. What is Right? Thnx!