8L90E/10L90E Trans Mount Adapter

The 8L90E/10L90E Trans Mount Adapter from G FORCE CROSSMEMBERS is purpose-built for builders and mechanics performing transmission swaps on modern GM vehicles. This adapter bridges the gap between newer eight-speed and ten-speed automatic transmissions and existing engine bay mounting points, eliminating the need for costly custom fabrication. Whether you're upgrading a classic chassis with contemporary powertrain technology or retrofitting a salvage transmission into a different platform, this adapter solves the alignment and mounting challenges that arise when OEM isolation points don't match.

Precision-engineered to tolerances that matter in real-world installation, the adapter accommodates the dimensional differences between the 8L90E and 10L90E transmission families and their corresponding crossmember configurations. The compact footprint (4.5 × 3.5 × 8 inches) and lightweight construction (0.835 lbs) mean minimal added mass while maintaining structural rigidity under load transfer. This is engineered hardware—not a compromise—designed to maintain proper transmission isolation and prevent driveline vibration issues that can develop when mounting points are misaligned or under-supported.

Professional builders, restoration shops, and experienced DIY fabricators will appreciate the quality and compatibility this adapter brings to complex drivetrain conversions. Installation requires basic mechanical knowledge and standard hand tools; proper alignment during mounting ensures transmission longevity and eliminates clunk under acceleration or deceleration. This adapter is essential for anyone undertaking a modern automatic transmission retrofit and demands a no-compromise solution to existing mount points.