Bigger power became an option in 1987 when Jeep stopped production of the 2.8 V6 for the XJ and began introduction of the inline six cylinder also known as
" The Power Tech Six " producing 177 hp and 224 ft lbs of torque.
A new electronically controlled four speed automatic transmission replaced the three speed, and also offered selectable shift modes. And lets not forget the new two tone paint option.
Engine options.
2.5L I4 TBI (fuel injected) - 117 hp @ 5000 rpm, 135 ftlb @ 3500 rpm - used in 86 and updated in 87-90 to 121hp.
Renault 2.1L 4cyl. Turbo Diesel - 85 hp @ 3750 rpm, 132 ft lb @ 2750 rpm - used in 85-87.
AMC 4.0 inline 6 "The Power Tech Six" - 177 hp @ 4500 rpm, 224 Ft. Lbs of torque used in 87 - 90.
The 84-86 Jeep Cherokee's used multiple manual and automatic transmissions.
Manual Transmissions
1987 Aisin Warner AX4 4-speed manual, used with the 2.5 liter 4 cylinder with a 21 spline output.
1987- 90 Aisin Warner AX5 5-speed manual, used with the 2.5 Liter inline 4, 2.1 Liter inline 4 diesel 21 spline output.
1987 - 89 Peugeot BA-10/5 5-speed manual used with the 4.0 Liter, 21 spline output.
1989 to 90 Aisin Warner AX15 5 speed manual used with 2.5 Liter, 2.5 Liter Diesel and 4.0 Liter inline 6, 26 spline output.
Automatic Transmissions
1987 to 90 Aisin Warner AW4 4 speed automatic, used with the 4.0 Liter.
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Transfer Cases
The transfer cases used are all chain driven with aluminum housings. NP stands for "New Process" which is the brand if you will. The newer ones are NV instead which stands for "New Venture". It is the same transfer case just a different name.
NP207 - "Command-Trac" part-time only - 2.61:1 ratio low range - used 84-87.
NP228/NP229 - "Selec-Trac" - 2Hi - 4Hi(full-time) - N - 4Lo (part-time) - used 84-87.
NP231 Command Trac, part-time only 2.72:1 ratio with Lo range 1987 - 2000. 2Hi, 4 Hi, N, 4Lo
NP242 Selec Trac, Full time/part time only, 2.72:1 ratio with low range. 2 Hi, 4 Full time, N, 4 Lo.
Driveshafts
Front driveshaft from 1987 onward is a " double cardan" two-piece driveshaft with a CV joint at the transfer case end.
Rear Driveshaft
The 228 and 229 transfer cases used a fixed output yoke, with a 2 piece driveshaft incorporating the slip spline. Otherwise, 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 1984 - 1995 XJ's the yoke slides in and out of the transfer case and is lubricated by transmission fluid internally.
Front Axles
The Dana 30
Dana 30 high pinion - reverse cut - 27 spline, 1.16" diameter shafts, 7.13" ring gear - used 84-99 some axles through 91 are vacuum disconnect. Some 89 and 90's have ABS and use the 5-297x UJoint
Rear Axles
The Dana 35, Crysler 8.25 or the Dana 44
Sometimes Dana 35 axles are referred to as Dana 35C - The "C" doesn't mean c-clip. It stands for "custom" meaning it came from Dana unfinished.
Note on 8.25 axles - none of these axles were used on XJs with ABS brakes. If you have ABS, you have the Dana 35. Without ABS you could have either axle.
Dana 35 non c-clip - 27 spline, 1.18" diameter shafts, 7.58" ring gear, 2.62" axle tube - used 84-89
Dana 44 Non C-clip - 30 spline, 1.31" diameter shafts, 8.5" ring gear, 2.75" axle tube, used 1987 - 1989 XJ's with the towing package.
Gearing
3.07 used with 4.0L manual transmission
3.55 used with the 4.0L engine with the automatic transmission, also used with the 2wd 4 cyl engines.
3.73 found in some XJ's with the towing package.
4.10 used with the 2.5L engine and older XJ's with the Off Highway vehicle package.
Suspension
Coil springs,control arms and two mono tube shocks in the front, leaf springs and two mono tube shocks in the rear. Each leaf spring pack contains 4 leafs.
Trim options
Base, Wagoneer, Pioneer, chief, Laredo, Limited,Sport
