The 4-speed 4L65E transmission is an updated version of the ever-popular 4L60E. Stock 4L65E transmissions were built to withstand 380 lb-ft. of torque with updated 5-pinion front and rear planetary gears compared to the 4L60E design. Raybestos Powertrain has developed GPZ material and a 3-4 clutch redesigned ZPak (RZP-001) clutch pack to combat the common 3-4 clutch failure point found in 4L60E and 4L65E transmissions. See more product details below.