Jaguar Gearbox: XJ8 / XJR car gearboxes for (XJ40) XJ6, XJ8 / XJR, XJ8 / XJR models
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The XF 4HP24 Gearbox
is a 4-speed automatic transmission for passenger cars from ZF Friedrichshafen AG.
Introduced in 1987, it is still in production and has been used in a variety of
cars as well as Jaguar.
Jaguar Hydraulic automatic transmissions
A cut-away model of a torque converter.
The predominant form of automatic transmission is hydraulically operated, using
a fluid coupling or torque converter and a set of planetary gearsets to provide
a range of torque multiplication.
Parts and operation
A hydraulic automatic transmission
consists of the following parts:
Fluid coupling or torque converter: A hydraulic device connecting the engine and
the transmission. It takes the place of a mechanical clutch, allowing the engine
to remain running at rest without stalling. A torque converter is a fluid coupling
that also provides a variable amount of torque multiplication at low engine speeds,
increasing "breakaway" acceleration.
Planetary gearset: A compound planetary set whose bands and clutches are actuated
by hydraulic servos controlled by the valve body, providing two or more gear ratios.
Valve body: hydraulic control center that receives pressurised fluid from a main
pump operated by the fluid coupling/torque converter. The pressure coming from this
pump is regulated and used to run a network of spring-loaded valves, check balls
and servo pistons. The valves use the pump pressure and the pressure from a centrifugal
governor on the output side (as well as hydraulic signals from the range selector
valves and the throttle valve or modulator) to control which ratio is selected on
the gearset; as the car and engine change speed, the difference between the pressures
changes, causing different sets of valves to open and close. The hydraulic pressure
controlled by these valves drives the various clutch and brake band actuators, thereby
controlling the operation of the planetary gearset to select the optimum gear ratio
for the current operating conditions. However, in many modern automatic transmissions,
the valves are controlled by electro-mechanical servos which are controlled by the
Engine Management System or a separate transmission controller.
Hydraulic & Lubricating Oil: called Automatic Transmission Fluid, or ATF, this
component of the
transmission provides lubrication,
corrosion prevention, and a hydraulic medium to convey mechanical power. Primarily
made from refined petroleum and processed to provide properties that promote smooth
power transmission and increase service life, the ATF is one of the few parts of
the automatic transmission that needs routine service as the vehicle ages.
The multitude of parts, along with the complex design of the valve body, originally
made hydraulic automatic transmissions much more complicated (and expensive) to
build and repair than manual transmissions. In most cars (except US family, luxury,
sport-utility vehicle, and minivan models) they have usually been extra-cost options
for this reason. Mass manufacturing and decades of improvement have reduced this
Applications of this gearbox
were made to Ford, Audi, BMW, LandRover
1987–1994 Jaguar XJ40 4.0
1989–1996 Jaguar XJS 4.0
1995–1997 Jaguar XJ6 (X300) 4.0
Other models of the Jaguar
that have various other gearboxes are:
Sports Car: XJ-S HE, XJS, XK8 / XKR, XK / XKR
Compact exec: X-Type
Executive car: S-Type XF
Full-size Car: XJ6, Series III XJ6, (XJ40) XJ6, XJ8 / XJR, XJ8
XJ12, Series III XJ12, XJ12
Supercar: 15 XJ220
Racing Car: XJRs, C R1/2/3/4