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dando vueltas por net. encontre esta info bien detallada sobre todos los tipos de xj existentes incluido el numero de vehiculos condtruidos por años.
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Jeep Cherokee (XJ) Stock Specifications

Author: ThePhantum

All XJs were built as a "Unibody"…meaning that the body and frame rails not just tied together, they are one piece, as opposed to a frame with the body mounted to it (like Wranglers are). All XJ's have solid axles in the front and in the rear. The suspension consists of coil springs up front and leaf springs in the rear. All XJ's came with disc brakes in the front and drums in the rear.
Dimensions

(There may be small differences, dependent upon trim level and/or optional equipment)

Wheelbase = 101.4"
Overall length = 165.3" - 168.8"
Overall width = 67.9" - 70.5"
Track = 58"
Height = 64" (with roof rack 66.8")
Ground clearance from differentials = 7.3" (Upcountry = 8.3")
Approach angle = 37.6º - 38º
Departure angle = 31º - 32.1º
Breakover angle = 21º - 21.9º
Curb weight 2wd = 2,891 lbs - 2,993 lbs
Curb weight 4wd = 3,057 lbs - 3,386 lbs
Cargo capacity = 71.0 cu ft.
Body

The body comes in both 2-door and 4-door styles with a rear hatch (liftgate).
In 94 side-impact beams were added to the doors and roof was strengthened. The 3rd brakelight was added to the top of the liftgate as well.

In 96 the body structure was strengthened some...it was not noticeable in overall appearance.
In 97 the body and interior were redesigned. Most noticeably it gave the body smoother lines by changing the bumpers, flares, and moldings. The front fender was trimmed just below the headlights and replaced with plastic bumper endcaps that wrap around to the wheel well. The windshield washer bottle was relocated to the inside of the drivers side front fender and the liftgate was also changed from fiberglass to sheet metal.

Engines

2.5L I4 carburated - 105 hp @ 5000 rpm, 132 ft lb torque @ 2800 rpm - used in 84-85 models
2.5L I4 TBI (fuel injected) - 117 hp @ 5000 rpm, 135 ftlb @ 3500 rpm - used in 86 and updated in 87-90 to 121hp

2.5L I4 MPI (multi-port injection) - 130 hp @ 5250 rpm, 139 ft lb @ 3250 rpm - used in 91-00

GM 2.8L V6 - 115 hp @ 4800 rpm, 145 ft lb @ 2400 rpm - used in 84-86

Renault 2.1L 4cyl. Turbo Diesel - 85 hp @ 3750 rpm, 132 ft lb @ 2750 rpm - used in 85-87

Italian VM 2.5L Turbo Diesel - 140 hp, 236 ft lb torque - used in overseas XJs

4.0L I6 EFI "Power Tech" - 177 hp @ 4750 rpm, 220 ft lb @ 4000 rpm - used 87-90
4.0L I6 MPI "Power Tech HO" (High Output) - 190 hp @ 4750 rpm, 220 ft lb @ 4,000 rpm - used in 91-95 and updated in 96-01 to 225 ft lb torque @ 3000 rpm (00-01 models use a distributorless ignition system)

Transmissions

Manual Transmissions

AX4 - 4 speed manual - manufactured by Aisin - used 84-86 with 2.5L I4 and 2.8L V6 engines
T4 & T5 - 4 & 5 speed manual - manufactured by Borg Warner - used 84-86 with 2.5L I4 and 2.8L V6 engines
BA10/5 - 5 speed manual - manufactured by Peugot - used only up to 89
AX5 - 5 speed manual - manufactured by Aisin - used with 2.8L V6 and 87+ with 2.5L I4
AX15 - 5 speed manual - manufactured by Aisin - used with 4.0L I6 engines
NV3550 - 5 speed manual - manufactured by New Venture - used in 00-01 in SE models with 4.0L I6 engines

Automatic Transmissions

Torqueflight 904 - 3 speed automatic - used 84-86 with 2.8L V6 and 2.5L I4 engines
30RH - 3 speed automatic - used with 2.5L I4 engine 94?-00
AW4 - 4 speed automatic, electronically controlled - manufactured by Aisin - used from 87-01 (87-91 models include a Power/Comfort button that adjusts the shift points)
Transfer Cases

All the transfer cases used are all chain driven with aluminum housings. T-cases were designated either NP or NV. They are essentially the same t-case...just a different "brand name" (NP was used for the purposes of this list:

NP ="New Process"
NV = "New Venture"

NP207 - "Command-Trac" part-time only - 2.61:1 ratio low range - used 84-87

NP231 - "Command-Trac" part-time only - 2.72:1 ratio low range - shift pattern 2H - 4H - N - 4L - used 87-01

NP228/NP229 - "Selec-Trac" - 4Hi(full-time) - N - 4Lo (part-time) - used 84-87

NP242 - "Selec-Trac" part-time OR full-time - 2.72:1 ratio low range - shift pattern 2wd - 4part-time - 4full-time - N - 4LO - used 87-01
Driveshafts

Front Driveshaft - On 84-87 XJs (NP207 t-case) the front shaft is a "GKN" style shaft. On 87-01 XJs (NP231/242 t-case) the front is a "double cardan" two-piece driveshaft with a CV joint at the transfer case end.

Rear Driveshaft - The rear is a one-piece shaft with standard u-joints at both ends. The slip yoke is located on the output shaft of the transfer case. On 84-95 models, the yoke slides in and out of the transfer case and is lubricated by the ATF fluid internally. On 96-01 due to a design change, the slip yoke is external (does not slide in and out of the transfer case). This slip yoke is covered with a rubber boot.