727 build fail

This was a fresh rebuild and failed within 5 miles. The sprag was inspected and was fine during assembly. I installed new springs and rollers. Im beginning to question the quality of the rollers, they came from rock auto.
The race did not spin in the case, it was nice and tight. No visible cracks in the case.
Everything in the trans looks great except for the sprag. Getting ready to order a 6 bolt bolt in sprag, roller rear support and valve body with low band apply.