Brian Tooley Racing BTR Flexplate Adapter Kit for GM LS

Flexplate Adapter Kit for GM LS Engines – Smooth Transmission Swaps

If you’re installing a TH350, TH400, Powerglide, or 700R4 transmission behind a GM LS-series engine, the Brian Tooley Racing (BTR) Flexplate Adapter Kit makes it a clean and reliable bolt-on solution. This adapter kit avoids the need for major transmission tunneling or machining and works exclusively with torque converters having a standard pilot length and 11.5 in. bolt pattern—common on TH350, TH400, Powerglide, and 700R4 applications. A spacer, flexplate, and hardware are included for a straightforward drop-in installation.