The General Motors 4T80E (or MH1) 4-speed automatic transmission was produced from 1992 to 2011 and was installed in front-wheel drive models with the Northstar V8 and older L26 engines. This automatic transmission is known from the Cadillac DeVille, Buick Lucerne, Oldsmobile Aurora, and Pontiac Bonneville.
Specifications
| Type | automatic transmission |
| Number of gears | 4 |
| Type of drive | front |
| Engine volume, l | up to 4.9 |
| Torque output, Nm | up to 415 |
| Recommended oil | ATF Dexron VI |
| Oil capacity, liter | 14.2 |
| Partial replacement, liter | 10.4 |
| Maintenance | every 80 000 km |
| Gearbox lifespan, km | ~350 000 km |
| Weight, kg | 111 |
Gear ratios GM 4T80E
Using the 2004 Cadillac DeVille with a 4.6-liter engine as an example:
| Main | 3.11 |
| 1st | 2.960 |
| 2nd | 1.626 |
| 3rd | 1.000 |
| 4th | 0.681 |
| Reverse | 2.130 |
Using
The transmission was installed on:
- Buick Lucerne 1 (GMX222) in 2005 – 2011;
- Cadillac Eldorado 12 in 1992 – 2000;
- Cadillac DTS I (GMX272) in 2005 – 2011;
- Cadillac DeVille 7 in 1993 – 1999;
- Cadillac DeVille 8 (GMX270) in 1999 – 2005;
- Cadillac SeVille 4 in 1992 – 1997;
- Cadillac SeVille 5 in 1997 – 2004;
- Oldsmobile Aurora 1 in 1994 – 1999;
- Oldsmobile Aurora 2 (GMX160) in 1999 – 2003;
- Pontiac Bonneville 10 (GMX310) in 2003 – 2005.
Disadvantages of the GM 4T80 gearbox
- This is a reliable and durable automatic transmission with a service life of over 300,000 km;
- The main problem is that owners forget to change the oil and filters;
- As a result, the solenoids become clogged with dirt, causing slippage during gear shifts;
- Ignoring this leads to expensive overhauls or the search for a used transmission;
- The automatic transmission lever can also jam in gear due to a broken plastic retainer.
