When ab 8 3/4 breaks................????????

The original 489 case 3:23 cone sure grip in my '69 Super Bee 440 4 speed blew out the pinion bearing after the crush sleeve failed.
Lots of burnouts with L-60-15s and a good Mcleod clutch didn't help............
Installed a 3:54 Dana 60 out of a rolled '68 GTX, problem solved!