The “MN8” 4L85-E is able to handle vehicles with up to 460 ft The 4L80 and 4L85 were built at Willow Run Transmission in Ypsilanti, Michigan. 4L80-Es have been optioned only in Chevrolet/GMC heavy duty pickups, vans, and commercial vehicles, and the Hummer H1, with the exception of certain Rolls-Royce, Bentley, Jaguar and Aston Martin models. It is an evolution of the Turbo-Hydramatic 400, first produced in October, 1963. Designed for longitudinal engine configurations, the series includes 4 forward gears. The 4L80-E (and similar 4L85-E) is a series of automatic transmissions from General Motors. Shift Solenoid ∾ Control Circuit Range/Performance Pressure Control Solenoid ∻ Control Circuit High Pressure Control Solenoid ∻ Control Circuit Low Pressure Control Solenoid ∻ Control Circuit Range/Performance Pressure Control Solenoid 'C' Performance or Stuck off Pressure Control Solenoid 'B' Performance or Stuck Off Shift Solenoid 'B' Performance or Stuck Off Shift Solenoid 'A' Performance or Stuck Off Torque Converter Clutch Circuit Intermittent Torque Converter Clutch Circuit Malfunction Output Speed Sensor Circuit Range/Performance Input/Turbine Speed Sensor Circuit Intermittent Input/Turbine Speed Sensor Circuit No Signal Input/Turbine Speed Sensor Circuit Range/Performance Transmission Fluid Temperature Sensor Circuit Intermittent P0715 Transmission Fluid Temperature Sensor Circuit High Input Transmission Fluid Temperature Sensor Circuit Low Input Transmission Fluid Temperature Sensor Circuit Range/Performance Every transmission is cold and hot tested before shipment. ► Complete road simulation using a dynamometer testing program called C.A.R.S. Modifications include updates to servos, the PR system, and valve body accumulators. ► Complete system correction and recalibration kit installed to address several OE flaws. ► All new, bushings installed in key locations to improve internal fluid flow control and fluid pressures. Upgrades exceed OE requirements and eliminate the possibilities of front seal leaks, premature bushing wear, and vibration. ► Fully remanufactured torque converter is tested for leaks, lock-up, concentricity, and balance. ► No Walkout rear case bushing is installed, addressing an OE flaw, to prevent case and output shaft damage. ► Updated pressure regulator prevents overly high pressure. ► Updated force motor for improved pressure control. ► Case connector is updated to the latest design on pre-1994 versions, and a vehicle harness pigtail is provided to address connection issues with the early design. ► EPC solenoid is tested separate from the transmission to confirm precise pressure control. ► All-new shift solenoids ensure positive shifting. ► Upgraded 34 element intermediate sprag increases holding capacity. ► Upgraded actuator feed limit valve prevents missing shifts and premature transmission failure. ► Fully remanufactured valve body, with complete system correction and recalibration kit, improves pressure control and shift quality.
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