Chevy Powerglide/TH 350-400 Flexplate Shield. The CSR Flexplate shield is designed for installations that require minimum sheet metal or chassis clearance. Each shield is precision molded of lightweight composite materials to ensure a tight fit to the transmission’s bell housing. Weighing approximately 1.5 lbs complete with hardware. Meets SFI. 30.1. SFI Certification valid 5 Years.