GM 4T40 transmission

Infobox Automobile
name=4T40/4T40-E/4T45/4T45-E
production=1995–present
manufacturer=General Motors
class=4-speed transverse automatic transmission
predecessor=Turbo-Hydramatic 125
successor=GM 6T40 transmission
similar=Ford CD4E
Chrysler A-670The 4T40 (and similar 4T40-E, 4T45, and 4T45-E) are a series of automatic transaxles from General Motors. Designed for transverse engine configurations, the series includes 4 forward gears. The 4Txx family replaces the Turbo-Hydramatic 125 transverse three speed automatic introduced in the early 1970s.

The "-E" series is electronically controlled and features an automatic overdrive transaxle with an electronically controlled torque converter clutch.

The 4T40 and 4T45 are assembled at Windsor Transmission in Windsor, Ontario, Canada.

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:

Applications:
* 1995–2005 Chevrolet Cavalier
* 1995-1996 Chevrolet Beretta
* 1995-1996 Chevrolet Corsica
* 1995–2005 Pontiac Sunfire
* 1997–2003 Chevrolet Malibu
* 1999–2005 Pontiac Grand Am
* 1999–2004 Oldsmobile Alero

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 Line 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.

Gear ratios:

Applications:
* 3.63:1
** Chevrolet Cobalt
** Pontiac Pursuit
** Pontiac Grand Am base
** Saturn Ion
** Saturn Vue
** Chevrolet Malibu 2.2
** Chevrolet Malibu Maxx 2.2
* 3.05:1
** Oldsmobile Alero 3.4
** Chevrolet Malibu 3.5
** Chevrolet Malibu Maxx 3.5
** Pontiac G6 V6
* 3.29:1
** Pontiac G6 GT
** Pontiac Grand Am GT & GT1
* 3.91:1
** Pontiac G6 base

References

*

ee also

* List of GM transmissions