The 4-speed automatic transmission ZF 4HP18 was produced at a German company from 1987 to 1998 and was installed on many popular front-wheel drive models such as Alfa Romeo 164, Peugeot 605. This gearbox was also installed on front-wheel or all-wheel drive versions of the Audi 100, A6, A8.
4HP family: 4HP14, 4HP16, 4HP18, 4HP20, 4HP22, 4HP24.
Specifications
| Production years | 1987 – 1998 |
| Type | automatic transmission |
| Number of gears | 4 |
| Type of drive | front / all wheel / rear |
| Engine volume, l | up to 3.0 |
| Torque output, Nm | up to 280 (350) |
| Recommended oil | Total Fluide AT42 |
| Oil capacity, liter | 8.3 |
| Partial replacement, liter | 4.0 |
| Maintenance | every 60 000 km |
| Gearbox lifespan, km | ~400 000 |
| Weight, kg | 4HP18Q – 86 4HP18FLE – 97 4HP18FLA – 136 |
In 1987, ZF introduced a new 4-speed automatic transmission with hydraulic control, in two versions: 4HP18Q for front-wheel drive models with a transverse engine and 4HP18FL for models with front-wheel drive and a longitudinally mounted power unit. In 1991, a couple more versions appeared: 4HP18FLE or 01K for front-wheel drive Audi models and rear-wheel drive Porsche models, as well as 4HP18FLA or 01F for all-wheel drive Quattro modifications.
In 1994, the most sophisticated version with electronic control, the 4HP18EH, debuted.
Gear ratios ZF 4HP18
Using the example of a Audi 100 1993 with a 2.8 liter engine:
| Main | 4.09 |
| 1st | 2.579 |
| 2nd | 1.407 |
| 3rd | 1.000 |
| 4th | 0.742 |
| Reverse | 2.88 |
Using
The transmission was installed on:
- Alfa Romeo 164 (Type 164) in 1989 – 1998;
- Audi 100 C4 (4A) in 1992 – 1994;
- Audi A6 C4 (4A) in 1994 – 1997;
- Audi A8 D2 (4D) in 1994 – 1996;
- Citroen XM I (Y3/Y4) in 1989 – 1998;
- Dodge Monaco 5 (B29) in 1989 – 1992;
- Eagle Premier 1 (B29) in 1987 – 1991;
- Fiat Croma I (154) in 1988 – 1996;
- Lancia Kappa I (838) in 1994 – 1998;
- Lancia Thema I (834) in 1989 – 1994;
- Peugeot 605 I (Y30) in 1989 – 1999;
- Porsche 968 I (968) in 1991 – 1994;
- Renault 25 (B29) in 1988 – 1992;
- Saab 9000 I (YS3C) in 1987 – 1998.
Disadvantages of the ZF 4HP18 gearbox
- This is a very durable automatic transmission and with frequent oil changes it has a huge resource, but sooner or later it will require a rebuild with replacement of the torque converter clutch, brake band, burnt clutches, as well as the oil pump and turbine shaft bushings.
- At especially used gearboxes, burst pistons and intermediate shaft bearings are replaced, and sometimes the damper spring of the brake band piston is destroyed.
