Gearbox ZF 8HP55

The 8-speed automatic transmission ZF 8HP55 was produced by the concern from 2009 to 2018 and was installed on powerful Audi models under the symbol 0BK, sometimes it is designated 8HP55A and 8HP55AF. There is a version of this gearbox for hybrid cars with the index 0BW or 8HP55AH.

1st generation of the 8HP family: 8HP45, 8HP55, 8HP70, 8HP90.

Specifications

Production years 2009 – 2018
Type automatic transmission
Number of gears 8
Type of drive all wheel
Engine volume, l up to 4.2
Torque output, Nm up to 700
Recommended oil ZF Lifeguard Fluid 8
Oil capacity, liter 9.0
Replacing the oil every 60,000 km
Replacing the filter every 60,000 km
Gearbox lifespan, km ~300 000
Weight, kg 141

Gear ratios ZF 8HP55

Using the example of a Audi A6 Quattro 2012 with a 3.0 TDi engine:

Main 2.375
1st 4.714
2nd 3.143
3rd 2.106
4th 1.667
5th 1.285
6th 1.000
7th 0.839
8th 0.667
Reverse 3.317

The transmission was installed on:

  • Audi A4 B8 (8K) in 2011 – 2015;
  • Audi A5 1 (8T) in 2011 – 2016;
  • Audi A6 C7 (4G) in 2011 – 2018;
  • Audi A7 C7 (4G) in 2011 – 2018;
  • Audi A8 D4 (4H) in 2009 – 2017;
  • Audi Q5 1 (8R) in 2012 – 2017.

Disadvantages of the ZF 8HP55 gearbox

  • This is a very reliable gearbox, but is often coupled with particularly powerful engines.
  • When driving aggressively, the solenoids quickly become clogged with friction wear products.
  • Vibrations from burnt clutches gradually break down the oil pump bearings.
  • Aluminum pistons and drums do not withstand constant sudden acceleration from a standstill.
  • Bushings and rubber gaskets in all automatic transmissions in the line require regular updating.

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