MJ Jeep Tech

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General Specs info

on Sat Apr 07, 2018 4:53 pm


Trims

1986 - Custom- The most basic Comanche trim that could be ordered.
1986 - X- One of the more "basic" trims of the Comanche.
1986 - XLS- A "step-up" version of the more "basic" Comanche trims.
1987-1992 - Base (SporTruck)- Became the most basic trim of the Comanche after 1986.
1988- Olympic Edition- Based on the Pioneer trim to commemorate the 1988 Summer Olympics and Team U.S.A. .
1987-1988 - Chief- Added more standard equipment to the base-level Comanche trims.
1987-1990 - Laredo- The top-of-the-line and most "up-level" trim on the Comanche.
1987-1992 - Pioneer- A "step-up" version of the base Comanche trim.
1988-1992 - Eliminator- The "sporty" Comanche trim.

Wheelbase:

Short Bed 2wd=113.1 4wd=112.9 (18 gal tank)
Long Bed 2wd=119.6 4wd=119.4 (16 gal [longbed, opt shortbed] 23.5 gal [opt longbed; standard from 1989)

Dimensions:

Overall length was 179.3" for shortbeds, 194.0" for longbeds
Overall curb height was 63.7" for 2wds, 64.7" for 4wds
Track width was 57" with the 15x6 rims, 58" with the 15x8s
Body width at the rear flares was 71.7"
Length of inside of box at the floor was 73.7" sb and 88.5" lb
Width of box at the floor is 55.3" for both sb and lb
Width between wheel wells is 43.8"
Box depth is 16.4"

Engines

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 became MPI in 91 and was rated for 130hp @ 5250 and 149 ftlb @ 3250)

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

Italian VM 2.8L Turbo Diesel - 140 hp, 236 ft lb torque - used in overseas MJs

2.1L 4 cylinder Turbo Diesel - 85 hp, 132 ft lb torque.

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 91-92

Transmissions

Manual Transmissions
AX4 - 4 speed manual - manufactured by Aisin - used 86-92 with 2.5L I4 and 2.8L V6 engines and 2.8L turbo-diesels
1st 4.74 also 3.92, 2nd-2.33, 3rd-1.44, 4th-1.00
T4 & T5 - 4 & 5 speed manual - manufactured by Borg Warner - used only in 86 with 2.5L I4 and 2.8L V6 engines
1st-4.03, 2nd-2.37, 3rd-1.50, 4th-1.00, 5th .86
AX5 - 5 speed manual - manufactured by Aisin - used with 2.8L V6 and 87+ with 2.5L I4
1st-3.92, 2nd-2.33, 3rd-1.44, 4th-1.00, 5th-0.85
AX15 - 5 speed manual - manufactured by Aisin - used with 4.0L I6 engines
1st-3.83, 2nd-2.33, 3rd-1.44, 4th-1.00, 5th-0.79
BA10/5 -5 speed manual - Peugeot used with 4.0L I6 engines 87 to late 89
1st-3.39, 2nd-2.33, 3rd-1.44, 4th-1.00, 5th-0.79

Automatic Transmissions
Torqueflight 904 - 3 speed automatic - used only in 86 with 2.8L V6 and 2.5L I4 engines and 2.8L turbo-diesels
1st-2.74, 2nd-1.54, 3rd-1.00
AW4 - 4 speed automatic, electronically controlled - manufactured by Aisin - used from 87-92 (87-92 models include a Power/Comfort button that adjusts the shift points, also known as a towing package; all transmissions came with the towing package and came with a transmission cooler; 88+ models used Power/Comfort switch for off-roading)
1st-2.80, 2nd-1.53, 3rd-1.00, 4th-.75

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.
NP207 - "Command-Trac" part-time only - 2.61:1 ratio low range - used 86
NP231 - "Command-Trac" part-time only - 2.72:1 ratio low range - shift pattern 2H - 4H - N - 4L - used 87-92
NP228 - "Select-Trac" part-time OR full-time - 2.6:1 ratio low range - used 86
NP242 - "Selec-Trac" part-time OR full-time - 2.72:1 ratio low range - shift pattern 2wd - 4part-time - 4full-time - N - 4LO - used 87-92

Driveshafts

Front Driveshaft - On 86-87 MJs (NP207 t-case) the front shaft is a "GKN" style shaft. On 87-92 MJs (NP231/242 t-case) the front is a "double cardan" two-piecedriveshaft 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 86-92 models, the yoke slides in and out of the transfer case and is lubricated by the ATF fluid internally.

Axles

Front Axles
Dana 30 high pinion - reverse cut - 27 spline, 1.16" diameter shafts, 7.13" ring gear - used 86-92 (all axles are vacuum disconnect, and have 5-260x u-joints)

Rear Axles
AMC-20 - 29 Spline, one piece axle shafts, 8.875" Ring Gear; Metric Ton axle in 86.
Dana 35 non c-clip - 27 spline, 1.18" diameter shafts, 7.58" ring gear, 2.62" axle tube - used 86-89
Dana 35 c-clip - 27 spline, 1.18" diameter shafts, 7.58" ring gear, 2.62" axle tube - used 89-92
Dana 44 non c-clip - 30 spline, 1.31" diameter shafts, 8.5" ring gear, 2.75" axle tube - used 87-89 on some, (not all) MJs equipped with towing package.
(note for D44's: All MJ's equipped with the stock D44 come with the Metric Ton Package)

Gearing

3.07 - used with 4.0L engine / manual transmission
3.55 - used with 4.0L engine / automatic transmission
4.10 - used with 2.5L engine usually
4.56 - rare but can be found on some older (~ 89 ~) models with 2.5L engine and auto transmission

Cooling Systems

Open style - any normal cooling system used today. Opposite of closed style described below. 91-92

Closed style - has no radiator cap and utilizes a pressure bottle. This style cooling system was used in 87-90

Production Numbers

MJ (4x4 only)

SWB/LWB
1986 23,251/xxxxx
1987 6,199/6,685
1988 6,895/9,167
1989 5,354/5,021
1990 3,283/2,129
1991 5,188 (TOTAL)
1992 3,142 (TOTAL)

Wheel

Bolt 5x4.5 pattern
15" 15X7 FACTORY ORIGINAL OEM STOCK STEEL

195/75r15 1986-1992 Diameter 26.5 Width 7.7 Sidewall 5.8
205/75r15 1986-1991 Diameter 27.1 Width 8.1 Sidewall 6.1
215/75r15 1990-1992 Diameter 27.7 Width 8.5 Sidewall 6.3
225/70r15 1990-1992 Diameter 27.4 Width 8.9 Sidewall 6.2
225/75r15 1986-1992 Diameter 28.3 Width 8.9 Sidewall 6.6

Optional tires that fit on factory Wheels
235/70r15 Diameter 28 Width 9.3 Sidewall 6.5
235/75r15 Diameter 28.9 Width 9.3 Sidewall 6.9
30/9.5r15 Diameter 30 Width 9.5 Sidewall 7.5
31/9.5r15 Diameter 31 Width 9.5 Sidewall 8
31/10.5r15 Diameter 31 Width 10.5 Sidewall 8



Drive Shaft info

longbed, 2.8, tf 3speed, np207, d35= 54"

longbed, 4.0, aw4, np231, d44= 48" d35= 49"

longbed, 4.0, aw4, 2wd d44= d35= 60.5"

longbed, 4.0, ax15-ba10/5, np231, d44= 49" d35= 50"

longbed, 4.0, ax15-ba10/5, 2wd d44=47" d35=48"

shortbed, 4.0, aw4, np231, d44= 41.25" d35= 42.35"

shortbed, 4.0, aw4, 2wd d44= 52.125" d35= 53.125"

shortbed, 4.o, ax15-ba10/5, np231, d44= 42.25" d35= 43.25"

shortbed, 4.0, ax15-ba10/5, 2wd d44= 52.125" d35= 53.125"

longbed, 2.5, ax5 d44= 63.75" d35= 64.75"

shortbed, 2.5 ax15 d44= 57.75" d35= 58.75"

shortbed, 2.5 ax4 d44= 57.5" d35= 58.5"


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