tech

Jeep Wrangler JT Concept

PRESS RELEASE:  Chrysler teamed up with the guys at Skunkwerks to build the long waited for Jeep truck.  Based on the JK Wrangler Unlimited the truck features all that is found in an unlimited along with a 5 foot bed.  Skunkwerks equipped the Jeep with a 3" lift, 35" BF Goodrich Mud-Terrain tires, and a Ramsey winch. 

According to Mark Allen, Jeep senior manager of the Product Design office, the JT was created from a chopped-up, two-door hardtop JK model with the addition of the steel bulkhead to divide the passenger compartment from the cargo area (from a Dakota pickup box). The JT is fitted with a five-foot truck bed cargo box measuring 47 inches wide by 61 inches long and sports a side opening tailgate as well as a removable top. The JT's pickup cab compartment retains the factory JK sport bar and the chassis uses the coil spring rear suspension of the civilian model JK (the military J8 has uses a Dana 60 and leaf spring suspension).

The JT truck prototype used the following:

  • Stock 3.8L V-6
  • Four-speed automatic transmission
  • NV2414:1 Rock-Trac transfer case
  • Front and rear Dana Model 44 axles with Tru-Lok electronic lockers 
  • BFGoodrich 35x12.50R-17 Mud Terrain T/A tires mounted on Custom 17x8-inch steel wheels from Stockton Wheel (the JT was lifted to accommodate 35-inch MT tires)
  • American Expedition Vehicles new Heat Reduction hood
  • Ramsey 9500 UT winch
  • American Expedition Vehicles JK front winch mount
  • Mopar rear bumper
  • Paint color called Hearing Aid Beige (...yes that's right?)
  • Aftermarket Hood
  • Some in-cab components are from AEV (American Expedition Vehicles)

           

Motor Trend gave the Jeep a once over and provided some images along with the Chrysler marketing photos.  Some of the images feature the JT tackling the trails of Moab.

Our opinion

Jeep should build this, period.  A small truck capable of carrying light loads and getting in and out of the trail confidently is a niche that stretches back to the days of the Commanche pickup.  Built on the reliable Wrangler platform and sharing lots of parts is a plus for the aftermarket.  One request to Jeep...no swinging rear gate...a true truck has a drop down tailgate.

Credits: Jeep, Motor Trend

Wrangler Unlimited Specifications

General Information
Vehicle Type       4-Door Sport Utility
Assembly Plant   Toledo, Ohio
EPA Class   Multipurpose vehicle
   

Engine:

   

3.8-Liter, OHV, 12-Valve SMPI V6

Availability   Standard
Type & Description   Six-cylinder, 60� V-type, liquid-cooled
Displacement   230.5 cu. in. (3,778 cu. cm)
Bore x Stroke   3.78x3.43 (96x87)
Valve System   OHV, 12 valves, roller followers, hydraulic lifters
Fuel Injection   Sequential, multiport, electronic
Construction   Cast-iron block, aluminum alloy heads
Compression Ratio   9.6:1
Power (SAE net)   205 hp (153 kW) @ 5,200 rpm (53.9 hp/L)
Torque (SAE net)   240 lbs-ft @ 4,000 rpm
Fuel Recommendation   Unleaded regular, 87 octane (R+M)/2
Oil Capacity   6 qt. (5.7L) plus filter
Coolant Capacity   13.36 qt. (12.64L) Std.
Emission Controls   Three-way catalytic converter, heated oxygen sensors, electronic EGR and internal engine features

Meets Tier 2 Bin 5 (federal) and LEV 2 (CA) emission requirements

 
 

Electrical System

   
Alternator   160A
Battery   600 CCA, maintenance-free
 

Transmission:

 NSG 370�Manual, Six-Speed Overdrive
Availability   Standard�All models
Description   Synchronized in all forward gears and reverse, multirail shift system with top-mounted shift lever
Clutch   Hydraulic actuation
Gear Ratios 1st   4.46
Gear Ratios 2nd   2.61
Gear Ratios 3rd   1.72
Gear Ratios 4th   1.25
Gear Ratios 5th   1.00
Gear Ratios 6th   0.84
Gear Ratios Reverse   4.06
Axle Ratio   3.21 Std., 4.10 Opt. (Std. on Rubicon)
Overall Top Gear   2.69 Std., 3.44 Opt. (Std. on Rubicon)
 

Transmission:

42RLE�Automatic, Four-Speed Overdrive

Availability   Optional
Description   Electronic governor, electronically controlled converter clutch
Gear Ratios 1st   2.84
Gear Ratios 2nd   1.57
Gear Ratios 3rd   1.0
Gear Ratios 4th   0.69
Gear Ratios Reverse   2.21
Axle Ratio   4.10
Overall Top Gear   2.83
 

Transfer Case:

   
NV241 Command-Trac
Type   Part-time
Operating Modes   2WD High; 4WD High; Neutral; 4WD Low
Low Range Ratio   2.72:1
Center Differential Type   None
     

Transfer Case:

   

NV241OR Rock-Trac

Type   Part-time, heavy-duty
Operating Modes   2WD High; 4WD High; Neutral; 4WD Low
Low Range Ratio   4.0:1
Center Differential Type   None
  
 

Dimensions And Capacities

   
General Overall Length   173.4 (4404.4)
Overall Width
(without mirrors)
  73.7 (1872.9)
Overall Height, Hardtop   70.9 (1,800.1)
Wheelbase   116.0 (2946.4)
Track, Front   61.9 (1,572.3)
Track, Rear   61.9 (1,572.3)
Overhang, Front   26.7 (679.2)
Overhang, Rear   30.6 (777.9)
Maximum Payload
(includes occupants & cargo)
  1,000 lbs. (373 kg)
 
 

Curb Weight

   
Wrangler X, Man. Trans   4075 lbs. (1848 kg)
Wrangler X Auto. Trans   4100 lbs. (1860 kg)
Wrangler Sahara, Man. Trans   4269 lbs. (1936 kg)
Wrangler Sahara, Auto. Trans   4294 lbs. (1948 kg)
Wrangler Rubicon, Man. Trans   4315 lbs. (1957 kg)
Wrangler Rubicon, Auto. Trans   4340 lbs. (1969 kg)
     

Accommodations

   
Seating Capacity, F/R   2/3
Front Headroom   41.3 (1,048.4)
Front Leg Room   41.0 (1,040.3)
Front Shoulder Room   55.8 (1,416.7)
Front Hip Room   55.6 (1,412.8)
Seat Travel   Driver�9.4 (239.5), passenger�9.4 (239.5)
Front Volume Index
cubic ft. (cu. meters)
  54.6 (1,545)
Rear Headroom   40.4 (1026.2 mm)
Rear Leg Room   37.2 (  944.9 mm)
Rear Shoulder Room   56.8 (1442.7 mm)
Rear Hip Room   56.7 (1440.2 mm)
Rear Seat Volume Index
cu. ft. (cu. meters)
  49.4 (1.40 cu. m)
Cargo Liftover Height   31.4 (  797.6 mm)
Maximum Cargo Width at Swing Gate Opening   58.7 (1,490.4)
Minimum Cargo Width at Swing Gate Opening   37.0 (939.2)
Maximum Cargo Height at Swing Gate Opening   37.1 (943.5)
Minimum Cargo Height at Swing Gate Opening   37.0 (939.2)
Distance Between Wheelhouses   44.7 (1,135.6)
Cargo Volume
cubic ft. (cu. meters)
Rear Seat Installed
  56.5 cu. ft. (1.60)
Rear seat folded   86.75 (2.46 cu. m)
Rear Seat Upright   46.43 (1.31 cu. m)
 

Body And Chassis

   
Layout
  Longitudinal front engine, four-wheel drive
Construction   Ladder-type frame, open steel body
     

Suspension

   
Front   Live axle, leading arms, track bar, coil springs, stabilizer bar,
low-pressure (on 16-inch wheel packages) gas-charged shock absorbers�std.; Monotube high-pressure (on 17- and 18-inch wheel packages) gas-charged shock absorbers�std. Rubicon;
Electronic Sway Bar Disconnect System (ASDS) opt.
 
Rear   Live axle, trailing arms, track bar, coil springs, stabilizer bar, low-pressure (on 16-inch wheel packages) gas-charged shock absorbers�std.; Monotube high-pressure (on 17- and 18-inch wheel packages)  gas-charged shock absorbers�std. Rubicon
 
     

Steering

   
Type   Power, recirculating ball with damper
Overall Ratio   16.7:1 overall
Turning Diameter (curb-to-curb)   34.9 ft. (10.62 m.)
Steering Turns (lock-to-lock)   3.5
     

Brakes

   
Availability   Standard�All
Power Assist Type   10 (254) single-diaphragm vacuum
Four-Wheel Anti-Lock with on- and off-road calibrations   Standard
Electronic Stability Program (ESP)   Standard
Parking Brake Type   Drum-in-hat
Front Size and Type   11.9x1.1 (302x28) vented rotor with 2.6 (66) single-piston floating caliper
Swept Area (total front)   190.8 sq. in. (1,230.97 sq. cm.)
Rear Size and Type   12.44x0.47 (316x12) solid rotor with 1.9 (48) single-piston floating caliper
Swept Area (total rear)   55.4 sq. in. (357.6 sq. cm.)
     

Wheels

   
Availability   X Standard
Type and Material   Painted Steel
Size   16x7.0
Availability   X Optional
Type and Material   Painted Cast Aluminum
Size   16x7.0
Availability   Sahara Standard
Type and Material   Painted Cast Aluminum
Size   17x7.5
Availability   Rubicon Standard
Type and Material   Machined Cast Aluminum
Size   17x7.5
Availability   Sahara Optional
Type and Material   Painted Cast Aluminum
Size   18x7.5
     

Tires

   
Availability   X Standard
Size and Type   P225/75R16, On/Off-Road, Black Side Wall
Mfr. and Model   Goodyear Wrangler ST
Revs per Mile (km)   712 (1,146)
Availability   X Optional
Size and Type   P245/75R16, On/Off-Road, Black Side Wall
Mfr. and Model   Goodyear Wrangler SRA
Revs per Mile (km)   687 (1,106)
Availability   Sahara Standard
Size and Type   P255/75R17, On/Off-Road, Outlined White Lettered
Mfr. and Model   Goodyear Wrangler SRA
Revs per Mile (km)   661 (1,064)
Availability   Sahara Optional
Size and Type   P255/70R18, On/Off-Road, Outlined White Lettered
Mfr. and Model   Bridgestone Dueler 693
Revs per Mile (km)   653 (1,051)
Availability   Rubicon Standard
Size and Type   LT255/75R17, Off-Road, Black Side Wall
Mfr. and Model   BFGoodrich Mud Terrain
Revs per Mile (km)   650 (1,046)

Vehicle Clearances

Clearances P225/75R16 P245/75R16 P255/75R17 P255/70R18 LT255/75R17
Approach Angle
Degree
40.8 42.0 43.8 44.6 44.3
Breakover Angle
Degree
21.8 23.1 24.9 25.5 25.4
Departure Angle
Degree
37.4 38.7 40.3 40.6 40.4
Front Axle to Ground (inches) 9.1 9.6 10.3 10.6 10.5
Rear Axle to Ground (inches) 8.8 9.4 10.1 10.3 10.2