Trans Mount Adapter Bracket GM LS to 4L80E

The Trans Mount Adapter Bracket GM LS to 4L80E is a purpose-built transmission mounting solution designed for LS-engine swaps into classic GM A-Body and G-Body vehicles from 1978–88. This bolt-on adapter bridges the mechanical gap between modern LS powerplants and the robust 4L80E four-speed automatic transmission, enabling enthusiasts and performance builders to mate newer engine platforms with proven transmission architecture without extensive fabrication or custom welding.

Manufactured from heavy-duty steel and finished in durable black paint, the HOOKER Trans Mount Adapter Bracket provides rigid, vibration-damping engine-to-frame isolation where it matters most. The adapter's precision-engineered mounting points ensure proper drivetrain geometry and alignment, critical for preventing premature wear on driveshaft, transmission, and differential components during acceleration and load transfer. At 2.77 lbs and measuring 6.6 x 6.6 x 6.75 inches, the bracket maintains a compact footprint while delivering the structural integrity required for high-output LS conversions, whether naturally aspirated or forced-induction builds.

This adapter is essential for anyone undertaking a serious LS-swap project on second-generation Chevelle, Malibu, Monte Carlo, or Cutlass platforms. By simplifying the transmission mounting interface and reducing custom fabrication labor, the Trans Mount Adapter Bracket accelerates build timelines and improves long-term reliability. Professional engine builders, restoration shops, and experienced DIY restomod builders rely on this proven HOOKER component to establish a solid mechanical foundation before addressing fuel, cooling, electrical, and driveline integration on these classic muscle-car platforms.