Having just purchased a 2001 S-type (JDM) and not getting a clear enough answer above, I thought I would do some research and post it for others.
Mostly a composite of info from cruising the web:
When the new S-Type arrived in showrooms, the S-type was initially well received. It was complimented for its exceptional ride and handling, which many pundits didn't expect because of the American-influenced platform. It also came with a choice of punchy new V6 and established V8 powertrains, both of which delivered excellent performance and whisper-quiet high-speed refinement.
By far the biggest criticism was levelled at the car's interior - its overuse of light-coloured plastics, bland dash and weird-looking steering wheel weren't in keeping with what people had come to expect from Jaguar, and it took the company just two-and-a-half years to completely revise the fascia to replicate the look of the new, smaller X-type (whose cabin was allegedly quickly redesigned following the S-type's reception).
2002 Interior (LHD)
2004 Interior with leather wheel
2007 Interior (LHD)
At the same time as the interior facelift, Jaguar revealed the supercharged S-type R, which had been rumoured to have been in development from launch. The 4.2-litre powerplant came with a Eaton supercharger and kicked out 400bhp, making it a real beast.
The front did not change much over the years
The rear-drive S-Type, which went on sale in May 1999 as an early 2000 model, serves as the entry-level Jaguar.
A new S-TYPE Sport edition will be offered for 2002 and comes with either engine and features that include 17-inch low-profile tires, a Computer Active Technology Suspension, a perforated leather-trimmed interior and bolstered sport seats.
Just three years after its introduction of the S-Type, Jaguar launched a redesigned version of this full-size sedan. On sale since May 6, 2002, the 2003 S-Type is highlighted by a new R edition that packs a 400-horsepower supercharged engine.
The 2003 S-Type sedans are equipped with approximately 70 percent new content and an all-new interior. Underneath the car is a new rear subframe with a revised rear suspension that includes retuned springs, dampers, bushings and stabilizer bars. Such changes should only enhance what Chief Engineer Phil Hodgkinson calls the “traditional Jaguar ride.” Aerodynamic improvements include spats for the front wheels, new mirrors, window shields and a revised seal at the top of the windshield. A touchscreen multimedia display is available, and the Jaguar voice system now works with 156 commands. A new electronic parking brake has been installed.
Unlike the more familiar Jaguar grille on other models, a mesh grille leads off the R edition. This high-performance model can also be identified by its distinctive red “R” logo. Zeus wheels on the R sedan hold 18-inch tires and halt with Brembo brakes, and it comes equipped with a spoiler at the rear. The non-supercharged V-8-powered models get 17-inch tires, while those with the V-6 engine have 16-inch rubber. Options include a power moonroof — which comes as standard equipment on V-8 models — and xenon high-intensity-discharge headlights that are standard on the R edition.
In late 2004, the S-type received another facelift, this time with new rear lights and revised rear badging.
The S-Type’s new grille is lower than before, and it sits more upright. Displaying a new round Jaguar badge, it incorporates slimmer vertical chrome vanes, as well as horizontal vanes.
The new aluminum hood has been reshaped, and the front bumper has a simpler appearance. The rear fender, bumper and trunk lip have been raised. Round taillamps help display what Jaguar calls a “more technical look” and “more presence.”
Mesh inserts are fitted in place of fog lamps in the S-Type R to allow air to reach the car’s twin oil coolers. The R edition also features a sporty mesh-patterned grille, a trunk spoiler and twin tailpipes.
The suspension has been modified to include retuned dampers and low-friction ball joints. The S-Type R gets Jaguar’s Computer Active Technology Suspension, which uses adjustable dampers. The available Sport Package for non-supercharged sedans includes an upgraded suspension and brakes. Five types of alloy wheels are available, and 17-inch tires are newly standard on the 3.0 model. Optional xenon headlights have automatic self-leveling.
Compare the rear 2003
The major changes for 2008 are to the S-Type's exterior. The 3.0 and 4.2 versions now share the S-Type R's front bumper. All S-Types now ride on wheels that are an inch larger than before, at 18 and 19 inches.
Displaying a round Jaguar badge, the grille incorporates horizontal vanes and slim vertical chrome vanes. Round taillamps help display what Jaguar calls a "more technical look [and] more presence."
Mesh inserts are fitted in place of fog lamps in the S-Type R to allow air to reach the car's twin oil coolers. The R edition also features a trunk spoiler, twin tailpipes and Jaguar's Enhanced Computer Active Technology Suspension, which uses adjustable dampers. The R models feature standard xenon headlights with automatic self-leveling.
Jaguar Cars is proud to unveil the new 2008 Model Year S-TYPE range, which comes with a host of exterior and interior design changes as well as a series of new standard and optional features.
The latest S-TYPE continues to be loved and admired by customers throughout the world, attracted on an emotional level by its spirit of individuality, iconic design and sporting performance. There is also a rational attraction as well, with the recent addition of the acclaimed twin-turbo 2.7-litre diesel engine which offers outstanding performance alongside superb fuel economy.
For the 2008 Model Year, all S-TYPE versions feature an updated front end, with the addition of the sporting S-TYPE R bumper and mesh grille to all models. The new-look front is more contemporary, giving every S-TYPE a more poised and dynamic appearance.
A new series of beautiful alloy wheels adds to the sporting appearance of the 2008 Model Year. Entry level versions now come with the multi-spoke 17-inch Antares wheel as standard. The 18-inch Triton alloy wheel is standard on all SE models (18-inch Triton on UK Sport version), while the top-of-the-range S-TYPE R now comes with the stunning 19-inch Barcelona wheel as standard (except Japan, Austria, Germany and rough road markets).
The S-TYPE's interior is also upgraded, with the introduction of multi-function Sport seats (with non-perforated leather) instead of the previous Classic seat for all SE and Sport models. Entry-level S-TYPE models come with a leather-trimmed steering wheel as standard, while a new Satin Mahogany veneer is available as an option across the range. Choice is further extended with the option of a beautiful new Ivory and Charcoal leather colour combination for SE models.
Technical innovation is part of the S-TYPE's appeal and every new model will now come with Rear Park Assist as standard.
The 2008 Model Year S-TYPE range will be unveiled at the Bologna Motor Show in December 2006 and will be available for order from dealers immediately. [PLEASE CONFIRM]
2008 Model Year S-TYPE at a glance
Executive Jaguar saloon with four engine variants including class-leading 2.7-litre twin-turbo diesel, 3.0-litre V6 petrol and renowned 4.2-litre naturally aspirated and supercharged V8s
Streamlined styling combined with advanced technology and legendary Jaguar ride and handling make the S-TYPE the epitome of the contemporary, sporting Jaguar saloon
From the top-of-the-range 400bhp (DIN), 155mph supercharged S-TYPE R which is capable of 60mph in just 5.3 seconds to the highly acclaimed twin-turbo 2.7-litre diesel which offers a 0-60mph time of just 8.1 seconds yet returns 41.5mpg on the combined fuel economy cycle, outstanding Jaguar innovation is clear across the range
The diesel-engined S-TYPE is offered with either a much-admired six-speed automatic or six-speed manual transmission. The 3.0-litre petrol is available with either a five-speed manual or six-speed automatic gearbox, while both 4.2-litre V8 models are equipped with the six-speed automatic transmission
AJD-V6 diesel engine is the lightest unit of its type and size, weighing just 202kg
Latest generation, high pressure, common-rail direct-injection technology, including 'multiple pilot' injection with piezo-electric control, ensures maximum efficiency
Maximum power of 152kW (207PS) EEC, 153kW (206bhp) DIN and maximum torque of 435Nm (320lb ft) make this a diesel Jaguar with real performance: a top speed of 230kph (143mph), and 0-100kph (0-60mph) in just 8.5 (8.1) seconds in the manual version and 8.6 (8.2) seconds in the auto
An impressive combined fuel economy figure of 6.8l/100km (41.5mpg) with manual gearbox, and a low CO2 figure of only 179g/km
Comprehensive safety features in every S-TYPE include front, side and side-curtain airbags, Jaguar's Adaptive Restraint Technology System (A.R.T.S.) and Anti-lock Braking System
Wide range of standard interior features in every S-TYPE including automatic climate control with dual zone control for driver and front passenger, Rear Park Assist, electrically adjustable seats, multi-function steering wheel controls for audio, cruise control and (where fitted) bluetooth telephone connectivity and voice control, trip computer, Jaguar Alpine Sound System with AM/FM radio and single slot CD player
Comprehensive security system includes remote central locking and driveaway locking, ultrasonic intrusion sensing, radio frequency remote control and engine immobiliser (Thatcham 1 approved)
Key optional features include 19-inch wheels across the range, electrically adjustable pedals, Front Park Assist, Adaptive Cruise Control with Forward Alert, in addition to existing driver aids.
not sure what gearboxes the x-type had
most had ford gearboxes 5R55N was a 5 speed, but thought later ones were ZF but maybe wrong
if its the Ford unit there very easy to service and low oil again would cause it to slip