Abstract: A self-locking, twist & lock, system for attachment of an engine flexplate to a torque converter mounting plate including a plurality of lugs carried on the end surface of the torque converter mounting plate in a circumferentially spaced-apart relationship to one another. A snap-lock spring retainer is releasably secured to each of the lugs. The flexplate has a plurality of retainer receivers in a circumferentially spaced-apart relation identical to the placement of the lugs. Each of the retainer receivers defining a retainer bar segment and openings for receiving the lugs and spring retainers. Each spring retainer has a flexible head portion adapted to engage a corresponding retainer bar segment to secure the plates together.