GM LS Series To GM TH400 Ultra-Bell

The GM LS Series To GM TH400 Ultra-Bell is a precision bellhousing adapter designed for engine swaps and high-performance builds, allowing LS-generation powerplants to connect seamlessly with classic TH400 transmissions. This product is ideal for enthusiasts looking to install an LS engine into vintage Chevrolet, Pontiac, or Oldsmobile muscle cars, or for those upgrading their resto-mods.

Constructed with precision machining, this adapter ensures proper alignment between the LS engine block and TH400 transmission case, which is crucial for smooth engagement and durability. The ultra-bell design maintains concentricity and is built to OEM tolerances, providing the necessary structural integrity for both street and strip applications.

This bellhousing adapter is particularly beneficial for builders transitioning from original small-block or big-block configurations to modern LS power. While it is designed to fit within most engine bay layouts, compatibility may vary based on specific vehicle configurations, making it essential for builders to verify fitment in their projects.