We had a lot of defective 3 fingered Borg and Beck clucthes come back,especially the 12 inch ones--Borg Warner finally told the parts stores to sell the diaphram 12 inch in its place--dont know if it was a design problem,or Borg Warners mexican rebuilding plant to blame--I blame the rebuilders,because I've seen many original GM clutches last well over 100,000 miles,but many of our customers didnt even get 10,000 miles out of the rebuilts,and they didnt abuse them.Maybe this is why its hard to find a rebiult clutch nowadays,their bad reputation kept mechanics from wanting to install one. The 12 inch B&B is a left leg killer,as already stated--I hated the one I had in my 72 K5,it broke 2 pressure plate fingers in a months time,couldnt shift it or stop it,it refused to disengage.I finally put an 11 inch diaphram type in it,worked fine--and I almost pushed the pedal through the floorboard the first time I depressed it,it was so easy compared to the other type clutch--almost thought there was something wrong it was so easy!. /forums/images/graemlins/crazy.gif