The 4T80E is a series of

automatic transmission An automatic transmission (sometimes abbreviated to auto or AT) is a multi-speed transmission used in internal combustion engine-based motor vehicles that does not require any input from the driver to change forward gears under normal driving ...

s from General Motors. Designed for

transverse engine A transverse engine is an engine mounted in a vehicle so that the engine's crankshaft axis is perpendicular to the direction of travel. Many modern front-wheel drive vehicles use this engine mounting configuration. Most rear-wheel drive vehicles ...

configurations, the series includes 4 forward gears. The 4Txx family is an evolution of the original

Turbo-Hydramatic 125 {{Infobox automobile , image=Ypsilanti Automotive Heritage Museum May 2015 060 (1979-2001 Hydra-Matic 3T40 transmission).jpg , caption=A Hydra-Matic 3T40 transmission, produced between 1979 and 2001, at the Ypsilanti Automotive Heritage Museum , na ...

transverse automatic introduced in the 1980 model year "X" body. The 4T80-E transmission is electronically controlled and features an automatic overdrive

transaxle A transaxle is a single mechanical device which combines the functions of an automobile's transmission, axle, and differential into one integrated assembly. It can be produced in both manual and automatic versions. Engine and drive at the s ...

with an electronically controlled

torque converter A torque converter is a type of fluid coupling that transfers rotating power from a prime mover, like an internal combustion engine, to a rotating driven load. In a vehicle with an automatic transmission, the torque converter connects the power ...

clutch. The 4T80 originally used a

viscous The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. Viscosity quantifies the inte ...

clutch, but this was changed in 2005. The 4T80 is built at

Willow Run Transmission Willow Run Transmission (also called Ypsilanti Transmission Operations, YTO) was a General Motors factory in Ypsilanti Township, Michigan. Acquired by GM in 1953, it produced Hydramatic and other automatic transmissions for use in vehicles built by ...

Ypsilanti, Michigan Ypsilanti (), commonly shortened to Ypsi, is a city in Washtenaw County in the U.S. state of Michigan. As of the 2020 census, the city's population was 20,648. The city is bounded to the north by Superior Township and on the west, south, an ...

4T80-E

The "MH1" 4T80-E is able to handle vehicles up to 8000 lb (3628.74 kg) GVWR. The final drive ratio is 3.11:1, 3.48:1, or 3.71:1. The 4T80 uses a

clutch, which was replaced with EC3 (electronically controlled converter clutch) in 2004. The 4T80-E is a hydramatic transmission and was developed for use with V8 front-wheel-drive cars, specifically for the Cadillac Northstar engine. It was designed with extreme power handling capabilities at the time. The 4T80-E debuted in the Cadillac Allanté in 1993 along with the Northstar

Double Overhead Camshaft An overhead camshaft (OHC) engine is a piston engine where the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combustion cha ...

(DOHC) V8. It reportedly cost 80% more than a similar

GM 4T60 transmission {{Infobox automobile , image=Ypsilanti Automotive Heritage Museum May 2015 060 (1979-2001 Hydra-Matic 3T40 transmission).jpg , caption=A Hydra-Matic 3T40 transmission, produced between 1979 and 2001, at the Ypsilanti Automotive Heritage Museum , na ...

and weighed 60 lb (27 kg) more. This transaxle has been used in many of GM's front drive large sedans. The Cadillac Division had exclusive usage of the 4T80-E until the 1995

Oldsmobile Aurora The Oldsmobile Aurora is a luxury sports sedan, manufactured and marketed by General Motors from 1994 until 2003 over two generations — sharing platforms with Buick Riviera and using the Cadillac-derived G platform. At the time of produc ...

debuted. The Aurora had the 4.0L version of the Northstar V8 coupled to a 4T80-E. It wasn't until 2004 that

Pontiac Pontiac may refer to: *Pontiac (automobile), a car brand *Pontiac (Ottawa leader) ( – 1769), a Native American war chief Places and jurisdictions Canada *Pontiac, Quebec, a municipality ** Apostolic Vicariate of Pontiac, now the Roman Catholic D ...

got usage of this transaxle in the Bonneville GXP which employed a 275

horsepower Horsepower (hp) is a unit of measurement of power, or the rate at which work is done, usually in reference to the output of engines or motors. There are many different standards and types of horsepower. Two common definitions used today are t ...

version of the Northstar 4.6L V8. The 4T80-E was last used in 2011 on the Cadillac DTS and the Buick Lucerne (when equipped with the 4.6L Northstar). Gear ratios: Applications: * 3.11:1 ** 1994–2005

Cadillac Deville The Cadillac DeVille is the nameplate used by Cadillac over eight generations, originally used to designate a trim level of the 1949 Cadillac Series 62 and later to designate a standalone model in the brand range. The last model marketed specif ...

** 1993-2002

Cadillac Eldorado The Cadillac Eldorado is a luxury car manufactured and marketed by Cadillac from 1952 until 2002 over twelve generations. The Eldorado was at or near the top of the Cadillac line. The original 1953 Eldorado convertible and the Eldorado Brougham ...

** 1993-2004

Cadillac Seville The Seville was manufactured by Cadillac from 1975 to 2004 as a smaller-sized, premium model. It was replaced by the STS in 2004. Origin of the name The name of "Cadillac's first small car" was selected over a revival of LaSalle or the GM de ...

** 2006 Cadillac DTS *3.48:1 ** 1995-1999

* 3.71:1 ** 1996–2005

Concours/DTS ** 1993-2002

ETC ** 1993-2004

STS ** 1995-1999

** 2004–2005

Pontiac Bonneville The Pontiac Bonneville is an automobile built by Pontiac from 1957 until 2005. Bonnevilles were full-sized, with the exception of a brief period of mid-size between 1982 and 1986. The brand was introduced as a limited production performance conv ...

GXP ** 2006-2011 Buick Lucerne V8 ** 2001-2003

References

* * {{cite journal, title=Northstar is heart of Allante re-do for '93 - V-8 engine, General Motors' Cadillac Motor Car Div.'s new model roadster, journal=

Ward's Auto World Ward's is an American organization that has covered the automotive industry for over 80 years. The organization is responsible for several publications including, ''Ward's AutoWorld'', and ''Ward's Dealer Business''. Ward's also publish the an ...

, author=Joel D. Pietrangelo, issue=February 1992

4T80-E

References

See also