GM 4T80 transmission
 | This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks 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 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]
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.
4T80-E[edit]
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[5]. 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.[6]
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[7] (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).[8]
Gear ratios:
| 1 | 2 | 3 | 4 | R |
|---|---|---|---|---|
| 2.96 | 1.626 | 1.00 | 0.681 | 2.13 |
- 3.11:1
- 1994–2005 Cadillac Deville
- 1993-2002 Cadillac Eldorado
- 1993-2004 Cadillac Seville
- 2006 Cadillac DTS
- 3.48:1
- 1995-1999 Oldsmobile Aurora
- 3.71:1
- 1996–2005 Cadillac Deville Concours/DTS
- 1993-2002 Cadillac Eldorado ETC
- 1993-2004 Cadillac Seville STS
- 1995-1999 Oldsmobile Aurora
- 2004–2005 Pontiac Bonneville GXP
- 2006-2011 Buick Lucerne V8
- 2001-2003 Oldsmobile Aurora V8
Issues[edit]
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[10]
The 4T80E modulator has a propensity to crack causing fluids to get sucked up into the vacuum line. The pan gasket, torque converter, and seals have all been known to leak as a transmission begins to age. There are several electrical problems related to the transmission one of the most serious being it’s solenoids.[11]
most of these where fixed in the later models [12]
References[edit]
See also[edit]
- ^ a b c "GM/Chevrolet Transmission Parts".
- ^ a b https://atoc.ru/uploads/manual/5fb79976f29ee.pdf
- ^ a b "4T40-E/4T45-E, 4T80-E, & 6-speed Auto transmission info". www.gmtuners.com. Retrieved 2024-06-03.
- ^ a b "4T80-E TRANSMISSION for 500HP 3.6l VVT ???". Pennock's Fiero Forum. Retrieved 2024-06-03.
- ^ "4T40-E/4T45-E, 4T80-E, & 6-speed Auto transmission info". www.gmtuners.com. Retrieved 2024-06-03.
- ^ "Six speed manual thoughts". Antique Automobile Club of America - Discussion Forums. 2006-11-29. Retrieved 2024-06-03.
- ^ https://transpartsnow.com/gm-chevrolet-transmissions-parts/4t80e-transmission/#:~:text=This%20transaxle%20has%20been%20used,the%201995%20Oldsmobile%20Aurora%20debuted.
- ^ a b "ATK Engines 4030A-84: Remanufactured GM 4T80E FWD Automatic Transmission - JEGS". JEGS High Performance. Retrieved 2024-06-03.
- ^ "4T80E Rebuild Kit 4T80-E Automatic Transmission Transaxle Master Banner Overhaul Box Set". Oregon Performance Transmission. Retrieved 2024-06-03.
- ^ "4t80e woes". Cadillac Owners Forum. 2014-09-18. Retrieved 2024-06-03.
- ^ "4T80E Transmission for Sale, Remanufactured Rebuilt". Xtreme Performance. Retrieved 2024-06-03.
- ^ https://bobistheoilguy.com/forums/threads/4t80-reliability-and-06-northstar.379719/