Billet SFI Flexplate LS Flat to TH400/PG Trans

The MEZIERE Billet SFI Flexplate LS Flat to TH400/PG Trans (FPS174) is a precision-engineered flexplate designed for LS-series engine swaps mated to TH400 or Powerglide transmissions. Built from true billet steel and rated to SFI 29.2 specifications, this component delivers the reliability and balance demanded in high-performance engine conversion applications where drivetrain integrity is non-negotiable.

This flexplate features 168 teeth and internal balance design, engineered to accept LS-series flat crankshaft flanges while accommodating TH400 or Powerglide transmission input shafts. The true billet construction provides superior strength compared to cast alternatives, reducing flex under load and minimizing harmonics that can compromise driveline longevity. The SFI 29.2 certification ensures compliance with racing and high-output engine standards, making it suitable for street performance builds, drag racing platforms, and serious restomod projects where engine conversions demand validated engineering.

Builders undertaking LS swaps into classic cars, trucks, or dedicated race vehicles rely on MEZIERE flexplates to maintain OEM-equivalent or superior durability while adapting modern powerplants to vintage or alternative transmission platforms. The internal balance specification works in concert with matching internal-balance LS crankshafts and dampers, eliminating vibration that would otherwise shorten bearing life and accelerate component wear. This is a critical drivetrain coupling—not a maintenance item but a foundational element in any conversion requiring precision engineering and certified safety standards.