Home        Main menu


WJ Four-Wheel Drive Systems


4wd systems



WJ transfer cases
System Case Features
1. Quadra-Trac INV147 On-demand; utilizes a gerotor coupling for improved response; high-range only (does not include neutral or low-range positions).
2. Quadra-Trac IINV247 On-demand; includes low-range (2:72:1); single lever transfer case mode operation.
3. Selec-TracNV-242 Full-time; two speed with shift on the fly; includes low-range (2:72:1); allows for two- or four-wheel-drive mode; full or part-time 4WD; single lever transfer case mode operation.
4. Quadra-DriveNV247 On-demand; utilizes a gerotor coupling in the Quadra-Trac II transfer case and in the Vari-Lok front and rear progressive axles to send torque to the front driveshaft and/or from side-to-side within each axle when wheel slippage occurs; includes low-range (2:72:1) single-lever transfer case mode operation.




Quadra-Drive shifter





WJ drive systems availability

System 1999-2000 2001 2002 2003 2004
1. Quadra-Trac I®

NV-147

Mode:

4WD High, full-time
N/A N/A N/A N/A Laredo I6 (opt)
Laredo V8 n/a

All other models n/a

2. Quadra-Trac II®

NV-247

Modes:

4WD High
NEUTRAL
4WD Low, part-time
Laredo I6 (opt)
Laredo V8 (std)

Limited I6 (opt)
Limited V8 (std)

Laredo I6/V8 (opt)


Limited 'G' (std)
Limited 'K' n/a

Laredo I6/V8 (opt)


Limited 'G' (std)
Limited 'K' n/a

Overland n/a

Spec Edition I6 n/a
Spec Edition V8 (std)

Sport (?)

Laredo I6/V8 (opt)


Limited 'G' (std)
Limited 'K' n/a

Overland n/a

Laredo I6 (opt)
Laredo V8 (std)

Limited 'G' (std)
Limited 'K' n/a

Overland n/a

Spec Edition I6 (opt)
Spec Edition V8 (std)

Freedom V8/V8HO (std)

Columbia I6 n/a
Columbia V8HO (std)

3. Selec-Trac®

NV-242

Modes:

2WD
4WD High, full-time
4WD High, part-time
NEUTRAL
4WD Low, part-time
1999:
Laredo I6 (std)
Laredo V8 (n/a)

2000:
Laredo I6 (std)
Laredo V8 (opt)


Limited I6/V8 (opt)
(no-cost option with V8)

Laredo I6/V8 (std)


Limited I6/V8 (opt)
(no-cost option with V8)

Laredo I6/V8 (std)
 

Limited I6/V8 (opt)

Overland n/a

Spec Edition I6 (std)
Spec Edition V8 n/a

Sport I6/V8 (std)

Laredo I6/V8 (std)
 

Limited I6/V8 (std)

Overland n/a

Laredo I6 (std)
Laredo V8 n/a

Limited n/a

Overland n/a

Spec Edition I6 (std)
Spec Edition V8 n/a

Freedom I6 (std)
Freedom V8/V8HO n/a

Columbia I6 (std)
Columbia V8HO n/a

4. Quadra-Drive®

NV-247

Modes:

4WD High
NEUTRAL
4WD Low, part-time
Laredo "D" n/a
Laredo 'E' (opt)
Laredo 'F' (opt)

Limited 'G' (opt)
Limited 'K' (opt)

Laredo 'E' n/a
Laredo 'F' n/a
Laredo 'S' (opt)

Limited 'G' n/a
Limited 'K' (std)

Laredo n/a
 

Limited 'G' (opt)
Limited 'K' (std)

Overland (std)

Spec Edition n/a

Sport n/a

Laredo n/a
 

Limited 'G' (opt)
Limited 'K' (std)

Overland (std)

Laredo n/a


Limited 'G' (opt)
Limited 'K' (std)

Overland (std)

Spec Edition n/a

Freedom n/a

Columbia n/a


WJ limited-slip differentials
(Vari-Lok equipped axles use a progressive, hydro-mechanical speed-sensing torque transfer coupling)

Type 1999-2000 2001 2002 2003 2004
Trac-Lok 1999
Optional all models
n/a with V8

2000
Optional all models
n/a with V8
n/a with QTII or Quadra-Drive

Optional all models
(2WD only)
Replaced with Vari-Lok starting in 2002
Front Vari-Lok
(Dana 30 axle)

Available only with (and included with) all QuadraDrive systems

Rear Vari-Lok
(Dana 44 axle)
Laredo "D" n/a
Laredo 'E' (opt)
Laredo 'F' (opt)

Limited 'G' (opt)
Limited 'K' (opt)

(Available only with QuadraDrive systems for 1999-2000)

Laredo (opt)

Limited 'G' (opt)

Limited 'K' (std)

Laredo (opt)

Sport n/a

Limited 'G' (opt)

Limited 'K' (std)

Overland (std)

Spec Edition n/a

Laredo (opt)

Limited 'G' (opt)

Limited 'K' (std)

Overland (std)

Laredo (opt)

Limited 'G' (opt)

Limited 'K' (std)

Overland (std)

Spec Edition (opt)

Freedom n/a

Columbia n/a





WJ Transfer case specifications



Type 1: NV147 Quadra-Trac ITM

  • On-demand 4-wheel drive transfer case with one operating range - the only operating range is 4-high
  • 2004 Laredo models only, available as a no-cost option

Operating Modes: 4WD High, full-time

Center Differential: Planetary with low-range lock

Torque Split: Variable (0-100%)

Under normal driving conditions, the system operates conventionally, and the majority of available torque is applied to the rear wheels. However, when front-to-rear wheel speed variations exist, the progressive differential transfers torque to the axle with the better traction, thus minimizing wheel spin and maximizing control.

A circular ID tag is attached to the rear case of each transfer case. The ID tag provides the transfer case model number, assembly number, gear ratio and location of manufacture. The transfer case serial number also represents the date of build.


NV 147 transfer case

NV-147 Fill and drain plug locations




Type 2: NV247 Quadra-Trac IITM

Quadra-Trac II transfer case


Quadra-Drive shifter
  • Type: Progressive On Demand
  • Full time 4WD operation sends power to both the front and rear axles under normal driving conditions and automatically transfers torque to the front as needed
  • Gerotor pump in the transfer case transfers power immediately to the front axle when wheel slip is detected. provides four-wheel drive power automatically, with no driver input
  • Includes a low-range mode for severe road conditions and low-speed pulling power
  • Includes a neutral mode that allows the vehicle to be towed
The NV247 is an on-demand 4-wheel drive transfer case with two operating ranges and a neutral position. Under normal driving conditions, the system operates conventionally, and the majority of available torque is applied to the rear wheels. However, when front-to-rear wheel speed variations exist, the progressive differential transfers torque to the axle withthe better traction, thus minimizing wheel spin and maximizing control.

Operating Modes:

4WD High, full-time (Sends power to all wheels)
NEUTRAL (Allows vehicle to be towed)
4WD Low, part-time (Doubles the transfer case gear ration for severe road conditions and low-speed pulling power)

Low Range Ratio: 2.72:1

Center Differential: Gerotor pump-applied disc clutch with low-range lock

Torque Split: Variable (0-100%)

Maximum Capacity Torque: 1800 lbs.-ft.

Weight: 83 Lbs.

Oil Fill Capacity: 2.5 pts.

A circular ID tag is attached to the rear case of each transfer case. The ID tag provides the transfer case model number, assembly number, serial number, and low range ratio. The transfer case serial number also represents the date of build.


NV 247 transfer case

NV-247 Fill and drain plug locations
       
NV 247 Quadra-Trac system

NV-247 Quadra-Trac drive system




Type 3: NV242 Selec-Trac®

NV242 transfer case


Quadra-Drive shifter
  • Type: Full-time
  • Full time 4WD operation sends power to both the front and rear axles under normal driving conditions.
  • Open center differential enables four-wheel drive operation on any road surface.
  • Shift-on-the-fly capability allows switching between two-wheel drive, part-time high range 4WD and full-time 4WD, at speeds up to 55 mph
  • Available Trac-Lok limited-slip rear differential with torque-sensing device for maintaining traction on slippery surfaces. Automatically distributes torque to the rear wheel with the most traction, thereby reducing wheel spin at the other wheel
The NV242 provides full time 2-wheel, or 4-wheel drive operation. A differential in the transfer case is used to control torque transfer to the front and rear axles. A low range gear provides increased low speed torque capability for off road operation. The low range provides a 2.72:1 reduction ratio

The 2WD and 4x4 full time ranges can be used at any time and on any road surface. The 4x4 part-time and 4 Lo ranges are for off road use only. The only time these ranges can be used on hard surface roads, is when the surface is covered with snow and ice.

The geartrain is mounted in two aluminum case halves attached with bolts. The mainshaft front and rear bearings are mounted in aluminum retainer housings bolted to the case halves. Two versions of the NV242 are used in the WJ vehicles, NV242LD and NV242HD. The two transfer cases can be distinguished from one another by the rear output shaft retainer. The NV242LD uses a rubber boot to cover the rear output shaft, while the NV242HD uses a cast aluminum housing.

Operating Modes:

2WD (Sends all power to rear wheels)
4WD High, full-time (Sends power to all wheels)
4WD High, part-time (Locks both front and rear driveshafts for increased traction)
NEUTRAL (Allows vehicle to be towed)
4WD Low, part-time (Doubles the transfer case gear ration for severe road conditions and low-speed pulling power)

Low Range Reduction Ratio: 2.72:1

High Range: 1:1

Center Differential: Open, Planetary with low-range lock

Torque Split: F/R 48/52

Maximum Capacity Torque: 1486 lb.-ft. (LD); 2028 lbs.-ft. (HD)

Weight: 86 Lbs. (LD); 90 lbs (HD)

Oil Fill Capacity: 2.85 pts. (LD); 6.5 pts. (HD) (ATF+4)

A circular ID tag is attached to the rear case of each transfer case. The ID tag provides the transfer case model number, assembly number, serial number, and low range ratio. The transfer case serial number also represents the date of build.


NV 147 transfer case

NV-242 Fill and drain plug locations
       
NV 242 Selec-Trac

NV-242 Selec-Trac drive system




Type 4: Quadra-DriveTM

(NV-247 or NV-147 transfer case with Vari-Lok axles)

Quadra-Drive shifter

  • On-demand 4WD system, utilizes a gerotor and coupling in the Quadra-Trac II transfer case and Vari-Lok front and rear axles for transferring torque from side to side
  • Sends torque to the rear wheels under normal driving conditions, able to send 100% of power to just one wheel when needed
  • Operates at maximum capability all the time
  • Includes a low-range mode for severe road conditions and low-speed pulling power
  • Includes a neutral mode that allows the vehicle to be towed

Operating Modes:

4WD High, full-time (Sends power to all wheels)
NEUTRAL (Allows vehicle to be towed)
4WD Low, part-time (Doubles the transfer case gear ration for severe road conditions and low-speed pulling power)

Low Range Ratio: 2.72:1

Center Differential: Gerotor pump-applied disc clutch with low-range lock

Torque Split: Variable (0-100%)

A circular ID tag is attached to the rear case of each transfer case. The ID tag provides the transfer case model number, assembly number, serial number, and low range ratio. The transfer case serial number also represents the date of build.


NV 247 transfer case

NV-247 Fill and drain plug locations
       
Quadra-Drive system

NV-247 Quadra-Drive drive system


Special thanks to Hooligan of Jeeps Unlimited for contributing information for this page






Home     Main menu