ZF 4HP18 transmission

The ZF 4HP18 is a four-speed automatic transmission for passenger cars from ZF Friedrichshafen AG. Introduced in 1987, and produced through 1998, it was used in a variety of cars from Alfa Romeo, Audi, Citroën, Dodge, Eagle, Fiat, Lancia, and Saab.

Specifications

Technical data

Gear Teeth and Ratios		Ravigneaux planetary gearset: Teeth		Count	Total	Avg.
Model	Version First Delivery	Sun 1.1 Ring 1.1	Sun 1.2 Ring 1.2	Brakes Clutches	Ratio Span	Gear Step
Gear	1	2	3	4		R
4HP 14	1984	29^[a] 82	34 29	2 3	3.2647	1.4835
Ratio	2.4118	1.3688	1.0000	0.7387		- 2.8376
4HP 18	FLE 1991	34^[a] 98	38 34	2 3	3.4737	1.5145
Ratio	2.5789	1.4067	1.0000	0.7424		- 2.8824

1. inner and outer sun gear of the Ravigneaux planetary gearset are inverted

Applications

4HP18FL

front wheel drive longitudinal engine

• 1988–1992 Renault 25 V6 2.8
• 1988–1992 Eagle Premier/Dodge Monaco V6 3.0

4HP18FLA (Audi Quattro 4x4)

Audi version: longitudinal engine, quattro four-wheel drive

• 1992–1994 Audi S4 (C4) 5-cyl 2.2 Turbo
• 1992–1994 Audi 100 (C4) CS 2.8 V6
• 1995–1997 Audi A6 (C4) quattro 2.8 V6
• 1995–1997 Audi S6 (C4) quattro 5-cyl 2.2 Turbo

4HP18FLE (Audi FWD)

longitudinal engine (non-quattro)

• 1991–1994 Porsche 968 4-cyl 3.0
• 1992–1993 Audi 100 2.8 V6
• 1992–1994 Audi 100 CS 2.8 V6
• 1992–1994 Audi 100 S 2.8 V6
• 1995–1997 Audi A6 2.8 V6
• 1995–1997 Audi A6 2.5 TDI (AEL) (AAT)

4HP18Q

front wheel drive transverse engine

• 1987–1989 Fiat 2000 2.0
• 1987–1989 Fiat 2500 2.5
• 1987–1998 Saab 9000
• 1989–1993 Alfa Romeo 164 V6 3.0
• 1989–1998 Citroën XM 2.0
• 1989–1998 Citroën XM V6 3.0
• 1989–1994 Fiat Croma 2.0
• 1989–1994 Lancia Thema 2.0
• 1989–1992 Lancia Thema V6 3.0
• 1989–1999 Peugeot 605 2.0
• 1989–1999 Peugeot 605 V6 3.0

4HP18QE

front wheel drive transverse engine

• 1993–1997 Alfa Romeo 164 V6 3.0
• 1993–1994 Lancia Thema V6 3.0

4HP18EH

front wheel drive transverse engine

• 1994–1998 Lancia Kappa V6 3.0

See also

• list of ZF transmissions

References

• (PDF). ZF-Group.com. Archived from the original (PDF) on 4 January 2006. Retrieved 11 February 2006.

^[1]

^[2]

1. 4HP18 FLA Transmission filter : https://www.allomatic.com/transmission-filters/515426
2. Transmissions Parts catalogue : https://global-uploads.webflow.com/5d4ad27f935075baaeb45f60/5fb67c61d98f56954b343a33_2020.11.18%20APC%20Catalog%20without%20images.pdf