Jeep Grand Cherokee WJ - WJ Four-Wheel Drive Systems

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This page last updated: July 7, 2014

WJ Four-Wheel Drive Systems

WJ transfer cases
System	Case	Features
1. Quadra-Trac I	NV147	On-demand; utilizes a gerotor coupling for improved response; high-range only (does not include neutral or low-range positions).
2. Quadra-Trac II	NV247	On-demand; includes low-range (2:72:1); single lever transfer case mode operation.
3. Selec-Trac	NV-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-Drive	NV247	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.

WJ drive systems availability

System

1999-2000

2001

2002

2003

2004

1. Quadra-Trac I^®

NV-147

Mode:

4WD High, full-time

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

Special Edition I6 n/a
Special 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

Special Edition I6 (opt)
Special 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

Special Edition I6 (std)
Special 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

Special Edition I6 (std)
Special 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)

Special 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)

Special 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

Front Vari-Lok
(Dana 30 axle)

Available only with (and included with) all QuadraDrive systems

Rear Trac-Lok
(2WD only)
n/a with V8
n/a with QTII or Quadra-Drive

Optional all 2WD models
(except V8)

Replaced with Vari-Lok starting with 2002 model year

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)

Special Edition n/a

Laredo (opt)

Limited 'G' (opt)

Limited 'K' (std)

Overland (std)

Laredo (opt)

Limited 'G' (opt)

Limited 'K' (std)

Overland (std)

Special Edition (opt)

Freedom n/a

Columbia n/a

WJ Transfer case specifications

Type 1: NV147 Quadra-Trac I^TM

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 Fill and drain plug locations

Type 2: NV247 Quadra-Trac II™

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 Fill and drain plug locations

NV-247 Quadra-Trac drive system

Type 3: NV242 Selec-Trac^®

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)

NV-242 Fill and drain plug locations

NV-242 Selec-Trac drive system

Type 4: Quadra-Drive™
(NV-247 or NV-147 transfer case with Vari-Lok axles)

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%)

NV-247 Fill and drain plug locations

NV-247 Quadra-Drive drive system

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

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