ZF 9HP transmission

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Manufacturer ZF Friedrichshafen
Production 2013–
Body and chassis
Class 9-speed transverse automatic transmission

The ZF 9HP is a nine-speed automatic transmission, built by ZF Friedrichshafen AG subsidiary ZF Transmissions in Gray Court, South Carolina.[1] As a front-transverse transmission, it will debut in front-wheel drive and all-wheel drive vehicles. ZF touts the new design as being able to save an average of 16% in fuel usage over current 6-speed automatic transmissions. The tentative gear ratio spread is 9.81:1. The transmission will have a torque range between 280 and 480 Nm.[1]

The 9HP is only 0.24 inches (6mm) longer than and weighs 16.5 lbs (7.5 kg) less than the outgoing six-speed transmission. The compact packaging is achieved by using a number of innovative design features: A new compact hydraulic vane-type pump, two patented dog clutches which replace bulkier conventional clutch packs, and a nested gear set.[2]

Land Rover and Jeep demonstrated the world's first nine-speed automatic transmissions for a passenger car at the 2013 Geneva Motor Show.[2]

The 2014 Jeep Cherokee has the world's first nine-speed automatic transmission for a passenger vehicle to market.

How It Works[edit]

An Animated Drive Line Schematic & A Rotational Speeds Nomogram ZF 9HP Animated Schematic Drive Line & Nomogram.gif

These ordinates are positioned on the abscissa in strict accordance with the proportions of the sun gears' teeth numbers relative to those of their rings. Consequently, the output ratios on the ordinate C4 (carrier of the last planetary gearset RS4) follows closely to those of the actual transmission.


Interactive Nomogram to calculate all 10 gear ratios from the mechanical dimensions of the 4 epicyclic gearsets.

  • Gear Ratios:[3]
1 2 3 4 5 6 7 8 9 R
4.70 2.84 1.90 1.38 1.00 0.80 0.70 0.58 0.48 3.80

List of ZF 9HP variants[edit]

Name Weight Max. gasoline torque (N·m) Max. diesel torque (N·m) Application examples
9HP28 78 kg 280 280
9HP48 86 kg 480 450 Acura TLX, Chrysler 200, Fiat Doblò, Fiat 500X, Honda CR-V (2015-), Jeep Cherokee (KL), Jeep Renegade, Ram ProMaster City, Range Rover Evoque, Land Rover Discovery Sport







Ram Trucks[edit]

Land Rover[edit]

Potential future vehicles to use it[edit]


Some of the cars utilizing the ZF 9HP have had transmission-related recalls or TSBs issued.


The production of the 9HP at ZF's Gray Court facility in Greenville, South Carolina started in 2013 with 400,000 units produced per year.[8]

Production of 9HP at Indiana Transmission Plant I (ITPI) began in May 2013, followed by Tipton Transmission Plant at Tipton County, Indiana in 2014-05-13. The Chrysler transmission units used parts from Kokomo, Ind. Castings, with machining of the prismatic parts - housings, blocks and heads - done at Kokomo Transmission; and the rotating parts – gears and crank shafts – came from ITPI.[9]

External links[edit]

See also[edit]