GM 4T80 transmission
Motor vehicle From Wikipedia, the free encyclopedia
Motor vehicle From Wikipedia, the free encyclopedia
The 4T80E is a series of front wheel drive fully automatic transmissions from General Motors. Designed for transverse engine configurations, the series includes 4 gear bearing overdrive [1][2] 2 electronic shift solenoids, and electronic force motor to control line pressure.[3]
 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (April 2019) |
| 4T80-E | |
|---|---|
.jpg){kind=spacer} A Hydra-Matic 4T80 transmission at the Ypsilanti Automotive Heritage Museum | |
| Overview | |
| Manufacturer | General Motors |
| Production | 1993–2011 |
| Body and chassis | |
| Class | 4-speed transverse automatic transmission |
| Chronology | |
| Predecessor | Turbo-Hydramatic 125 |
| Successor | 6T70 |
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 to ECCC.[1][4][2][3]
The 4T80 is built at Willow Run Transmission in Ypsilanti, Michigan.
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 viscous torque converter clutch, which was replaced with EC3 (electronically controlled converter clutch) in 2005. Transmission broadcast codes in 2005 for the ECCC transmission are 5ABN and 5MMN.[1]
The 4T80-E is a hydramatic transmission and was developed for use with V8 front-wheel-drive cars, and at the time exclusively the Cadillac Northstar engine.[3] 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 (DOHC) V8. It reportedly cost 80% more than a similar GM 4T60 transmission and weighed 60 lb (27 kg) more.[5]
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[6] (may not be true) . The Aurora had the 4.0L version of the Northstar V8 coupled to a 4T80-E. It wasn't until 2004 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 was last used in 2011 on the Cadillac DTS and the Buick Lucerne (when equipped with the 4.6L Northstar).[7]
Gear ratios:
| 1 | 2 | 3 | 4 | R |
|---|---|---|---|---|
| 2.96 | 1.626 | 1.00 | 0.681 | 2.13 |
the transmission had no performance parts, causing stress at over 300 hp[4]
and in some use cenarios, faulty seals will degrade the entire transmission[9]
most of these where fixed in the later models [10]
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