GM 4T40 transmission
Encyclopedia
The 4T40-E and 4T45-E are a series of automatic
transaxle
s from General Motors. Designed for transverse engine
configurations, the series includes 4 forward gears. The 4Txx family replaced the Turbo-Hydramatic 125
transverse three speed automatic introduced in 1980.
The "-E" series is electronically controlled and features an automatic overdrive
transaxle
with an electronically controlled torque converter
clutch. Since the non-electronic versions of these transmissions does not exist, it is conventional to refer to these models as simply 4T40 and 4T45, leaving out the "-E".
The 4T40 and 4T45 are assembled at Windsor Transmission
in Windsor, Ontario
, Canada
.
Gear ratios:
Applications:
hybrid vehicle
with the addition of an auxiliary oil pump and hybrid-aware electronics. It is designed for 3.0–3.4 L engines producing up to 205 ft·lbf (278 N·m) of torque, but was also commonly mated to some versions of GM's 4-cylinder Ecotec line.
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...
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....
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 replaced the 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 three speed automatic introduced in 1980.
The "-E" series 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. Since the non-electronic versions of these transmissions does not exist, it is conventional to refer to these models as simply 4T40 and 4T45, leaving out the "-E".
The 4T40 and 4T45 are assembled at Windsor Transmission
Windsor Transmission
Windsor Transmission is a General Motors of Canada parts plant in Windsor, Ontario and one of several facilities in southern Ontario and Canada. It is only plant located in southwestern Ontario and located closer to GM headquarters in Detroit than GM Canada headquarters in Oshawa.It makes...
in Windsor, Ontario
Windsor, Ontario
Windsor is the southernmost city in Canada and is located in Southwestern Ontario at the western end of the heavily populated Quebec City – Windsor Corridor. It is within Essex County, Ontario, although administratively separated from the county government. Separated by the Detroit River, Windsor...
, Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...
.
4T40
The "MN4" 4T40E is able to handle vehicles up to 4000 lb (1814 kg) GVWR. The final drive ratio is 3.63:1. It is designed for 1.5–3.1 L engines producing up to 190 ft·lbf (258 N·m) of torque.Gear ratios:
| 1 | 2 | 3 | 4 | R |
|---|---|---|---|---|
| 2.95 | 1.62 | 1.00 | 0.68 | 2.14 |
Applications:
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- 1999–2005 Pontiac Grand Am Pontiac Grand AmThe original Grand Am was introduced in the fall of 1972 as a 1973 model. It was based on the GM A platform along with other cars such as the Pontiac LeMans, Pontiac GTO, Chevrolet Chevelle, Buick Century, and the Oldsmobile Cutlass Supreme...
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4T45
The "MN5" 4T45E is able to handle vehicles up to 4500 lb (2041 kg) GVWR. Final drive ratios include 3.63, 3.29, 3.05, and 3.91. This same transmission is used in the Saturn Vue Green LineSaturn VUE
The Saturn Vue is a compact crossover SUV that was sold by General Motors' Saturn marque, and at one time was Saturn's best-selling model. It was the first vehicle to use the GM Theta platform when it was introduced in 2002. A second generation model was launched in 2007 for the 2008 model as a...
hybrid vehicle
Hybrid vehicle
A hybrid vehicle is a vehicle that uses two or more distinct power sources to move the vehicle. The term most commonly refers to hybrid electric vehicles , which combine an internal combustion engine and one or more electric motors.-Power:...
with the addition of an auxiliary oil pump and hybrid-aware electronics. It is designed for 3.0–3.4 L engines producing up to 205 ft·lbf (278 N·m) of torque, but was also commonly mated to some versions of GM's 4-cylinder Ecotec line.
Gear ratios:
| 1 | 2 | 3 | 4 | R |
|---|---|---|---|---|
| 2.95 | 1.62 | 1.00 | 0.68 | 2.14 |
Applications:
- 3.63:1
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- Pontiac Pursuit
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- Chevrolet MalibuChevrolet MalibuMalibus and all other Chevelles were completely restyled for 1968 with semi-fastback rooflines on two-door hardtops and wheelbases split to on two-door models and 118 for four-door sedans and station wagons. Engine offerings included a new V8 rated at that replaced the V8 that had served as the...
2.2
- Chevrolet Cobalt
- 3.05:1
- Oldsmobile AleroOldsmobile AleroThe Oldsmobile Alero was a compact car produced by the Oldsmobile division of General Motors from 1999 to 2004.The Alero was introduced in spring 1998 as a 1999 model to replace the Achieva and Cutlass. The Alero went into production on April 6, 1998. All Aleros were built in Lansing, Michigan...
3.4 - Chevrolet MalibuChevrolet MalibuMalibus and all other Chevelles were completely restyled for 1968 with semi-fastback rooflines on two-door hardtops and wheelbases split to on two-door models and 118 for four-door sedans and station wagons. Engine offerings included a new V8 rated at that replaced the V8 that had served as the...
3.5 - Chevrolet Malibu Maxx 3.5
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V6
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- 3.29:1
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GT - Pontiac Grand AmPontiac Grand AmThe original Grand Am was introduced in the fall of 1972 as a 1973 model. It was based on the GM A platform along with other cars such as the Pontiac LeMans, Pontiac GTO, Chevrolet Chevelle, Buick Century, and the Oldsmobile Cutlass Supreme...
GT & GT1
- Pontiac G6
- 3.91:1
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base
- Pontiac G6