7/5/2023 0 Comments 4l80e transmissionIt communicates efficiently with the Engine Control Module through the onboard vehicle CAN bus network. The TCM (Transmission Control Module) refers to the highly adaptive learning computer smartly integrated within the transmission valve body. Other General Motors applications are still going to follow soon. This automatic transmission also arrived with a considerably enhanced Park/Neutral safety switch and modified transmission line pressure solenoid. The H1 received a 4L80 along with its dedicated T42 transmission computer in 2004. Despite this, several performance aficionados always prefer to efficiently reprogram the 4L80E automatic transmission in order to run as a very simple, ON-OFF solenoid. The torque converter – when applied in factories – is heavily controlled via a PWM lock-up solenoid for seamless lock-up action. Part of the Powertrain Control Module’s strategy includes shift stabilization, which contributes significantly to reducing hunting. Some vehicles using this automatic transmission come with shift maps that the driver can select, based on usage, including towing, etc. The 4L80E Automatic Transmission TechnologyĮvery 4L80E automatic transmission makes use of electronic controls, which are generally from the Powertrain Control Module. Dexron VI, another brand, highly superseded its previous transmission fluids, claiming that it has significantly improved the transmission performance as well as a more extraordinary fluid life and transmission. The company required this fluid formulation’s warranty in the 4L80E series. GM specified a brand-new automatic transmission fluid formulation in 2006, though this development was not regarded as a transmission change. A few differences between this transmission and the 4L80E include a 5-pinion reaction gearset, a 5-pinion output gearset, etc. In 2002, the 4L85 automatic transmission entered the market. However, it became a huge success and continued to be enhanced throughout its production span, even with extra changes entering when required. The 4L80E automatic transmission is by no means perfect and has its share of glitches. This included the Silverado, Sierra, Suburban, Hummer H1, etc. In 1991, GM trucks rolled out into the market, bearing the 4L80E automatic transmission. Instead, the 4L80E transmission showcases an integrated bellhousing with the Chevrolet 90-degree engine bolt pattern only. However, the 4L80E never featured a removable bellhousing, unlike the 4L60E automatic transmission. The 4L80E features a die-cast aluminum case, just like most other GM automatics. The 4L80E transmission features a large 32 spline output shaft – much like the TH400 transmission – in the numerous 2WD and 4WD applications. However, its indexing bore diameter was efficiently changed. The rear tail housing bolt pattern was not tampered with in any way. But the added overdrive gear gave the 4L80E an edge over its predecessor, even though it required a somewhat longer case and an extra gear set. GM relied heavily on – and used – several parts or components and designs derived from the TH400 transmission when developing the 4L80E. Although the 700R4 was a tough transmission, it could not really hold a candle to the TH400 transmission.Īnd for this particular reason, GM had no choice but to start developing a pretty heavy-duty automatic overdrive. GM quickly recognized a gap revealed by the rapidly expanding success of the 4L80E/700R4 automatic transmission. It was practically the last hold-out of the entire old-school automatics with no overdrive or lock-up converter. The latter is a tough and enduring transmission at GM – as well as other marques. The Development of the 4L80E TransmissionĪs mentioned briefly earlier, the 4L80E automatic transmission was directly developed from the TH400 transmission. Note that the terms ‘4L80’ and ‘4L85’ may be used without adding the suffix, ‘É.’ This is because every GM automatic is electronically controlled now and, therefore, doesn’t need differentiation. Every reference to the 4L80E also applies to this variant, except where stated otherwise. The latter is constructed such that it can efficiently handle heavy-duty use. In this post, you will learn more about the 4L80E transmission as well as its variant, i.e., the 4L85E. This automatic transmission has remained in production through the 2009+ model year. The 4L80E also features a lock-up torque converter, an added overdrive gear, as well as state-of-the-art electronic controls. It is constructed to a great extent on the 400 in strength and parts. The legendary TurboHydramatic TH400 automatic transmission was the 4L80E transmission’s immediate predecessor. The 4L80E transmission was introduced in the GM C/K Trucks line-up – to the delight of motorists – in 1991.
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