TH400 / 4L80E Center Support Reinforcement / Case Saver
66CSR. TH400 / 4L80E Center Support Reinforcement. These transmissions are bad about blowing out the center support lugs because there is no support on the bottom side. Use with no intermediate band a thin pressure plate. TH400 Hi-Performance applications w / brake: Intermediate clutch snap ring retainer, machined from billet aluminum, prevents distortion of intermediate pressure plate and case lug blow-out!