It broke where they typically do. Nothing new here, you just found a known problem. Should not happen again with the sleeved drum. However, I am surprised it broke at your weight and power. Seems like it help for a really long time. Definitely will have no problems with the sleeved unit.
99' Silverado RCSB Z71: 5.7L Iron LS1, 11.2:1, Custom EPS Cam, Ported 862's,Ported TB, E-Bay Cold Air, E-Bay Long Tubes, Dynomax X-Pipe Exhaust, Electric Fans, Innovative LC-1, Self Built 4L60E, Circle D Pro Single Disc, 4:10 ValueTrac
Everything else in the transmission looked perfect, the band has been in there for 4 years...still looked new, the 3-4 z-pack had some wear causing clearance from new(installed) to go from .050, to its used state .060. Also installed the HD 2-3 shift valve for racing in "3rd" gear selector position, should help support the sprag. I also ended up installing the wide rear sun gear bushing as well.
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