Turbo-Hydramatic 125
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| Turbo-Hydramatic 125 | |
| Manufacturer: | General Motors |
|---|---|
| Production: | 1974–2002 |
| Successor: | 4T40-E/4T45-E 4T65-E 4T80-E |
| Class: | 3-speed transverse automatic transmission |
| Related: | Turbo-Hydramatic |
| Similar: | Ford ATX Chrysler A-404 |
The Turbo-Hydramatic 125 was the first in a line of automatic transmissions from General Motors designed for transverse engine application. Introduced in 1974, the line evolved into today's 4T40/45/65/80 line.
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[edit] Turbo-Hydramatic 125
The 3-speed Turbo-Hydramatic 125 was introduced in 1980 and produced through 2002. It carried over some parts from the light-duty Turbo-Hydramatic 200 and 350, but was generally a new design.
The 125 was renamed 3T40 later, following GM's new naming convention. The 4T40-E replaced it starting in 1995.
Applications:
- 1982–1989 Chevrolet Celebrity
- 1980–1985 X-body
- 1982–2002 J-body
- 1987–1996 Chevrolet Beretta/Chevrolet Corsica
- 1995–2001 Chevrolet Cavalier
- 1990– Chevrolet Lumina APV
- 1984-1988 Pontiac Fiero
[edit] Turbo-Hydramatic 125C
This was a later model of the 125 that included a ECU controlled solenoid that would engage the torque converter into "lock up" where engine power was transferred directly to the axle. The C comes from the use of a torque converter clutch (TCC). The solenoid that controls this is notorios for failure, their failure is indicated by an engine stall when braking from speeds greater that 45 MPH. This occurs because the clutch does not disengage and the engine cannot produce enough output to keep the vehicle in motion.
[edit] Turbo-Hydramatic 440-T4
A 4-speed version of the 125 was created for the 1984 G-body/K-body cars, the Turbo-Hydramatic 440-T4. Many parts were identical to the 125, though it was generally stronger and included an overdrive fourth gear. A special strengthened F-7 version was also used for the 1987–1992 Cadillac Allanté.
The 440-T4 was later renamed the 4T60.
The electronically-controlled 4T60-E was introduced in 1988. By 1991, all 4-speed front wheel drive automatic GM cars used this unit. It would become the basis of the GM 4T65 transmission, still used today.
A heavy-duty version, the 4T60 HD was introduced in 1991 and produced through 1993 for the supercharged GM 3800 engine.
Applications:
- THM 440-T4
- 1984–1990 G-body
- 4T60-E
- 1988-1999 most front-wheel drive GM cars
- F-7
- 1987–1992 Cadillac Allanté
