Created by Reid, this extremely rigid case will not flex, or move under acceleration, allowing the internal shafts to run true without binding. The results are less component wear & galling, cooler operating temperatures, faster elapsed times, and no fluid leaks. Virtually 100% of all Powerglide parts bolt-in. No flexplate shield is required - bellhousing is SFI 30.1 certified. One-piece design creates optimum internal bore alignments for maximum gear life and power transfer. Case is SFI 4.1 certified with optional integral case liner.