Clutch or Cone type?

definately go with a clutch type rebuildable suregrip, dont get a cone type. i had one in my 71 charger, it went bad and i semi rebuilt it myself, this involved maching the metal cone down. there was a lot of metal powder in the bottom of the housing from the cones, it is metal against metal in these types of units, not a good thing , i dont know how the bearings survive in these types of suregrips.