GM 4T80 transmission
Encyclopedia
The 4T80E is a series of automatic transmission
s from General Motors. Designed for transverse engine
configurations, the series includes 4 forward gears. The 4Txx family is an evolution of the original Turbo-Hydramatic 125
transverse automatic introduced in the 1980 model year "X" body.
The 4T80-E transmission is electronically controlled and features an automatic overdrive
transaxle
with an electronically controlled torque converter
clutch. The 4T80 originally used a viscous clutch, but this was changed in 2005.
The 4T80 is built at Willow Run Transmission
in Ypsilanti, Michigan
.
clutch, which was replaced with EC3 (electronically controlled converter clutch) in 2005.
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 first debuted in the Cadillac Allante
in 1993 along with the Northstar Double Overhead Camshaft
(DOHC) V8. It reportedly cost 80% more than a similar GM 4T60 transmission 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
debuted. The Aurora had the 4.0L version of the Northstar V8 coupled to a 4T80-E. It wasn't until 2005 that Pontiac
got usage of this transaxle in the Bonneville
GXP which employed a 275 horsepower
version of the Northstar 4.6L V8.
The 4T80-E is still in use today, on the Cadillac DTS
and the Buick Lucerne
(when equipped with the 4.6L Northstar).
Gear ratios:
Applications:
Automatic transmission
An automatic transmission is one type of motor vehicle transmission that can automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually...
s from General Motors. Designed for transverse engine
Transverse engine
A transverse engine is an engine mounted in a vehicle so that the engine's crankshaft axis is perpendicular to the long axis of the vehicle. Many modern front wheel drive vehicles use this engine mounting configuration...
configurations, the series includes 4 forward gears. The 4Txx family is an evolution of the original Turbo-Hydramatic 125
Turbo-Hydramatic 125
The Turbo-Hydramatic 125 was the first in a line of automatic transmissions from General Motors designed for transverse engine application. Introduced in 1980, the line evolved into today's 4T40/45/65/80 line.-Turbo-Hydramatic 125:...
transverse automatic introduced in the 1980 model year "X" body.
The 4T80-E transmission is electronically controlled and features an automatic overdrive
Overdrive (mechanics)
Overdrive is a term used to describe a mechanism that allows an automobile to cruise at sustained speed with reduced engine RPM, leading to better fuel economy, lower noise and lower wear...
transaxle
Transaxle
In the automotive field, a transaxle is a major mechanical component that combines the functionality of the transmission, the differential, and associated components of the driven axle into one integrated assembly....
with an electronically controlled torque converter
Torque converter
In modern usage, a torque converter is generally a type of hydrodynamic fluid coupling that is used to transfer rotating power from a prime mover, such as an internal combustion engine or electric motor, to a rotating driven load...
clutch. The 4T80 originally used a viscous clutch, but this was changed in 2005.
The 4T80 is built at Willow Run Transmission
Willow Run Transmission
Willow Run Transmission is a General Motors factory in Ypsilanti Township, Michigan. Opened in 1953, it produced Hydra-Matic automatic transmissions for use by General Motors and others...
in Ypsilanti, Michigan
Ypsilanti, Michigan
Ypsilanti is a city in Washtenaw County in the U.S. state of Michigan. As of the 2000 census, the city population was 22,362. The city is bounded to the north by the Charter Township of Superior and on the west, south, and east by the Charter Township of Ypsilanti...
.
4T80-E
The "MH1" 4T80-E is able to handle vehicles up to 8000 lb (3629 kg) GVWR. The final drive ratio is 3.11:1, 3.48:1, or 3.71:1. The 4T80 uses a viscous torque converterTorque converter
In modern usage, a torque converter is generally a type of hydrodynamic fluid coupling that is used to transfer rotating power from a prime mover, such as an internal combustion engine or electric motor, to a rotating driven load...
clutch, which was replaced with EC3 (electronically controlled converter clutch) in 2005.
The 4T80-E is a hydramatic
Hydramatic
Hydramatic was an automatic transmission developed by both General Motors' Cadillac and Oldsmobile divisions. Introduced in 1939 for the 1940 model year vehicles, the Hydramatic was the first fully automatic mass-produced transmission developed for passenger automobile use.-History:During the...
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 first debuted in the Cadillac Allante
Cadillac Allanté
The Allanté was Cadillac's first venture into the ultra-luxury roadster market. The vehicle was sold from 1987 until 1993, with roughly 21,000 models built over its 7-year production run...
in 1993 along with the Northstar Double Overhead Camshaft
Overhead camshaft
Overhead cam valvetrain configurations place the engine camshaft within the cylinder heads, above the combustion chambers, and drive the valves or lifters in a more direct manner compared to overhead valves and pushrods...
(DOHC) V8. It reportedly cost 80% more than a similar GM 4T60 transmission 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
Oldsmobile Aurora
The Oldsmobile Aurora was a full-size sports sedan made by the Oldsmobile division of General Motors and launched in 1995. The Aurora rode on the same Cadillac-derived G platform as the 2-door Buick Riviera....
debuted. The Aurora had the 4.0L version of the Northstar V8 coupled to a 4T80-E. It wasn't until 2005 that Pontiac
Pontiac
Pontiac was an automobile brand that was established in 1926 as a companion make for General Motors' Oakland. Quickly overtaking its parent in popularity, it supplanted the Oakland brand entirely by 1933 and, for most of its life, became a companion make for Chevrolet. Pontiac was sold in the...
got usage of this transaxle in the Bonneville
Pontiac Bonneville
The Pontiac Bonneville was an automobile built by the Pontiac division of General Motors from 1957 to 2005. It was introduced as a limited production performance convertible during the 1957 model year...
GXP which employed a 275 horsepower
Horsepower
Horsepower is the name of several units of measurement of power. The most common definitions equal between 735.5 and 750 watts.Horsepower was originally defined to compare the output of steam engines with the power of draft horses in continuous operation. The unit was widely adopted to measure the...
version of the Northstar 4.6L V8.
The 4T80-E is still in use today, on the Cadillac DTS
Cadillac DTS
The Cadillac DTS is a full-size luxury sedan produced by General Motors, an American automobile company. The DTS replaced the Cadillac DeVille as General Motors' largest luxury car for the 2006 model year...
and the Buick Lucerne
Buick Lucerne
The Buick Lucerne is a full-size car sold by the Buick division of General Motors. Introduced at the 2005 Chicago Auto Show, the Lucerne replaced both the Park Avenue and the LeSabre for the 2006 model year, and was sold through the 2011 model year...
(when equipped with the 4.6L Northstar).
Gear ratios:
| 1 | 2 | 3 | 4 | R |
|---|---|---|---|---|
| 2.96 | 1.63 | 1.00 | 0.68 | 2.13 |
Applications:
- 3.11:1
- 1994–2005 Cadillac DevilleCadillac DeVilleThe de Ville was originally a trim level and later a model of General Motors' Cadillac marque. The first car to bear the name was the 1949 Coupe de Ville, a prestige trim level of the Series 62 luxury coupe. The last model to be formally known as a de Ville was the 2005 Cadillac Deville, a...
- 1993-2002 Cadillac EldoradoCadillac EldoradoThe 1953 Eldorado was a special-bodied, low-production convertible . It was the production version of the 1952 El Dorado "Golden Anniversary" concept car, and borrowed bumper bullets from the 1951 GM Le Sabre show car...
- 1993-2004 Cadillac SevilleCadillac SevilleThe Cadillac Seville is a luxury-type car that was manufactured by the Cadillac division of American automaker General Motors from 1975 to 2004, as a smaller-sized top-of-the-line Cadillac...
- 2006 Cadillac DTSCadillac DTSThe Cadillac DTS is a full-size luxury sedan produced by General Motors, an American automobile company. The DTS replaced the Cadillac DeVille as General Motors' largest luxury car for the 2006 model year...
- 1994–2005 Cadillac Deville
- 3.48:1
- 1995-1999 Oldsmobile AuroraOldsmobile AuroraThe Oldsmobile Aurora was a full-size sports sedan made by the Oldsmobile division of General Motors and launched in 1995. The Aurora rode on the same Cadillac-derived G platform as the 2-door Buick Riviera....
- 1995-1999 Oldsmobile Aurora
- 3.71:1
- 1996–2005 Cadillac DevilleCadillac DeVilleThe de Ville was originally a trim level and later a model of General Motors' Cadillac marque. The first car to bear the name was the 1949 Coupe de Ville, a prestige trim level of the Series 62 luxury coupe. The last model to be formally known as a de Ville was the 2005 Cadillac Deville, a...
Concours/DTS - 1993-2002 Cadillac EldoradoCadillac EldoradoThe 1953 Eldorado was a special-bodied, low-production convertible . It was the production version of the 1952 El Dorado "Golden Anniversary" concept car, and borrowed bumper bullets from the 1951 GM Le Sabre show car...
ETC - 1993-2004 Cadillac SevilleCadillac SevilleThe Cadillac Seville is a luxury-type car that was manufactured by the Cadillac division of American automaker General Motors from 1975 to 2004, as a smaller-sized top-of-the-line Cadillac...
STS - 1995-1999 Oldsmobile AuroraOldsmobile AuroraThe Oldsmobile Aurora was a full-size sports sedan made by the Oldsmobile division of General Motors and launched in 1995. The Aurora rode on the same Cadillac-derived G platform as the 2-door Buick Riviera....
- 2004–2005 Pontiac BonnevillePontiac BonnevilleThe Pontiac Bonneville was an automobile built by the Pontiac division of General Motors from 1957 to 2005. It was introduced as a limited production performance convertible during the 1957 model year...
GXP - 2006 Buick LucerneBuick LucerneThe Buick Lucerne is a full-size car sold by the Buick division of General Motors. Introduced at the 2005 Chicago Auto Show, the Lucerne replaced both the Park Avenue and the LeSabre for the 2006 model year, and was sold through the 2011 model year...
V8 - 2001-2003 Oldsmobile AuroraOldsmobile AuroraThe Oldsmobile Aurora was a full-size sports sedan made by the Oldsmobile division of General Motors and launched in 1995. The Aurora rode on the same Cadillac-derived G platform as the 2-door Buick Riviera....
V8
- 1996–2005 Cadillac Deville