NEW! GM 4L60-4L70-E Input Drum Reinforcement Kit
Prevent cracking of GM 4L60, 4L60-E, 4L65-E and 4L70-E input drum assemblies with the all-new Sonnax input drum reinforcement kit 77733-51K. Featuring a hardened steel sleeve that will not block clutch feed oil, this top-of-the-line kit includes a custom manufactured overrun piston designed to be used only with a stamped steel forward piston, eliminating the need to use OE cast forward pistons or aftermarket billet forward pistons. Learn more.