Created by Dedenbear, 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 and 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. Adjustable transbrake release controls hit on rear tires. 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.