Crank Adapter LS to Older GM Converters

The Crank Adapter LS to Older GM Converters from ALLSTAR PERFORMANCE is a precision engineering solution designed for engine builders and performance enthusiasts who need to mate modern LS-series crankshafts with traditional GM torque converters. This adapter sleeve bridges the mechanical gap between newer LS platform engines and legacy transmission converter interfaces, eliminating the need for expensive custom fabrication or complete converter replacement. Whether you're building a classic car restomod or upgrading an older GM platform with contemporary engine technology, this adapter is essential for maintaining proper converter-to-crank compatibility and ensuring reliable power transfer.

Manufactured from high-strength steel and finished in durable black oxide coating, the Crank Adapter LS to Older GM Converters provides corrosion resistance and longevity in demanding engine compartments. The black oxide finish protects against oxidation while maintaining a professional appearance in visible installations. Measuring 4 inches in length with precision-engineered internal and external geometry, this adapter ensures a secure, concentric fit that maintains the critical concentricity required for smooth transmission operation and minimal vibration. The compact 0.24-pound weight makes installation straightforward without requiring frame or mounting modifications.

This adapter benefits engine swap enthusiasts, restoration shops, and performance builders working on LS engine conversions into vehicles originally equipped with older GM transmission systems. Installation is typically performed during transmission assembly or engine-to-transmission mating, requiring proper alignment tools and technical familiarity with torque converter and crankshaft interfaces. The adapter is supplied as a single unit and integrates seamlessly into your existing converter and crankshaft configuration, making it an economical alternative to sourcing new converters or undergoing extensive machine work.