#4L80E TORQUE CONVERTER DRIVER#
#4L80E TORQUE CONVERTER SERIES#

Some vehicles which the 4L80E were used include: On the other hand, the 4L80E became more popular in Big Block gas and diesel engines given that Allison transmissions were used in medium-duty class (4000 series) trucks.

#4L80E TORQUE CONVERTER SERIES#

The 4L80E was designed to be used in the duty range of the 4L60E and the Allison series transmissions – these were transmissions the TH400 had already found use cases in. On the other hand, the 1997 and later 4wd applications may lack the rear sensor. It is also worthy to note that there are different placements of the speed signal, and it depends on the year in which the transmission was launched.įor instance, 1991 – 1996 4L80E’s have a speed sensor that is located at the driver’s side rear portion of the case. The data obtained is used to adjust the shift speeds depending on the conditions that are instantly detected. The input speed sensor is used to monitor input speeds, which are compared with the engine speed and output shaft sensor speed. Two-speed sensors can be found on the 4L80E transmission, and these sensors serve as a turbine input speed and output speed, respectively. On the other hand, a PWM lockup solenoid controls the 4L80E torque converter (in factory mode), and it helps to provide a smooth lockup execution. There is a portion of the PCM’s strategy for shift stabilization, which helps to reduce hunting.

#4L80E TORQUE CONVERTER DRIVER#

A driver has the option to select shift maps depending on the action such as towing they want to execute. The 4L80E transmission relies on electronic controls from the Powertrain Control Module (PCM). Nevertheless, updates were made throughout its production cycle, which has created a more revamped version of the transmission. The 4L80E featured an integrated bellhousing instead of a removable bellhousing of the 4L60E transmission.ĭespite these changes and the adoption of features prevalent in older models of the GM automatic transmission, the 4L80E had its problems.

The rear tailhousing bolt indexing bore diameter was changed on the 4L80E.

The 4L80E transmission is 4 inches longer than the TH400.

The transmission uses electronics to control shift points.

The 4L80E featured an overdrive fourth gear which required an extra gearset as well as a longer (1-1/2″) case.

The 4L80E featured a large 32 spline output shaft (even though much stronger) in its various 2wd and 4wd applications.

The rear tailhousing and bellhousing bolt pattern, as well as the flexplate of the TH400, was maintained in the 4L80E.

The 4L80E came with a die-cast aluminum case.

Similarly, about 75 percent of the 4L80E’s internal parts could be interchanged in the TH400. Hence, there was a need for a heavy-duty automatic transmission with an overdrive to be built.Īs such, GM took several internal components and designs from the TH400 to build a new transmission it named the 4L80E. The 4L80E was developed from the TH400, a heavy-duty automatic transmission that neither had a lockup torque converter nor an overdrive. Specifically, you could find this transmission in GM trucks such as Silverado, Sierra, Suburban, the Hummer H1. It was also adopted in Rolls Royce and Bentley vehicles. Some cars that used the 4L80E transmission include Chevrolet/GMC pickups, commercial vehicles, and vans. The ‘E’ means it requires an Electronic Control Unit (ECU) for control and firmness to enable its functionality.Īlso, the 4L80E performance transmission was designed for cars up to 16,500 lbs GVWR with towing capacity up to 22,000 LBS, and whose engine is up to 440 ft. vehicle weights for (80), and electronically controlled transmission (E). The term 4L80E denotes 4-Speed (4), Longitudinally mounted (L), 8000 lbs. We’ve outlined a detailed overview of the 4L80E transmission, its specifications, and what makes it popular in the current year, given that it has been a decade already since its production was discontinued. This transmission is a revamped version of the Turbo-Hydramatic TH400, which is why it does not come as a surprise that it features most of the internal components of the TH 400.ĭespite having similar parts and the same strength reputably known for the TH400, the 4L80E transmission takes it one step further to feature a lockup torque converter, overdrive gear, and advanced electronic controls. The 4L80E transmission was produced in October 1963 by General motors for longitudinal engine configurations.

4l80e torque converter