Just phoned yesterday about the cone type "sure-grip". Most places don't like to repair these because there's no relacement parts like the clutches. Some will however, depending on how worn it is maybe able to shim the cones, (How I don't know). Not only do the cones themselves ware, but the walls as well. (bad thing) like no rotors left for your disc to work..
A place will look at mine at no cost. If can be repaired, min 250.00 Canadian starting. One other place told me 500.00 - 1000.00 (must be on drugs). :wack: What can I say...life's a gamble when buying a used rear. As stated, best buy a new unit to fit into your case and be done with it.
I'm sure you can get/buy a clutch unit for your case and just get the shop to put your 3:91s on
Just my thoughts..