Both Dizuster and I have failed roller clutches. His with LBA. We realized it was shuddering in low gear took it apart. Rollers were were wedged and twisted, many laid over 90 degrees. Nothing was damaged but the low roller. Mine has a Super sprag with non LBA valve body. It was recently disassembled for maintenance. The rear roller support bearing had lost it's press and slid out of the governor support. Being the rear drum has been converted to roller bearing, the drum is no longer piloted on the rear support. It pilots on the output shaft. This allowed the output shaft to wander around breaking a few tabs, half the springs and laying the rollers over at about a 20 degree angle. If it hadn't been removed for maintenance it wouldn't have been caught. Car worked perfect. Ran 1.25 60ft last two passes. Both cars have good drums.
Doug