Its not just builder driver error....
If anything breaks in the driveline and you don't pull the trans apart and check the sprag, you are rolling the dice....
Twice now over the years I seen guys who broke rears or driveshafts fix them, drive the car around the pits to make sure the trans was "ok" then proceed to blow the trans up the next pass.
The number one rule to follow. Even if you have the steel drum it can still ‘roll’ over the sprag, the good drum doesn’t stop that. If anything breaks in the drive train IN FIRST GEAR pull it!
