Welcome to the JeepSpecs.com in-depth page of WJ Generation Jeep Grand Cherokee four wheel drive system. Did we mis anything? Please get in touch with us and tell us about it!
WJ transfer cases |
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| 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 | |||
WJ drive systems availability
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| System | 1999-2000 | 2001 | 2002 | 2003 | 2004 | |
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N/A | N/A | N/A | N/A | Laredo I6 (opt) Laredo V8 n/aAll other models n/a |
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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/aOverland n/aSpecial Edition I6 n/a Special Edition V8 (std)Sport (?) |
Laredo I6/V8 (opt) Limited ‘G’ (std) Limited ‘K’ n/aOverland n/a |
Laredo I6 (opt) Laredo V8 (std)Limited ‘G’ (std) Limited ‘K’ n/aOverland n/aSpecial Edition I6 (opt) Special Edition V8 (std)Freedom V8/V8HO (std)Columbia I6 n/a Columbia V8HO (std) |
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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/aSpecial Edition I6 (std) Special Edition V8 n/aSport I6/V8 (std) |
Laredo I6/V8 (std) Limited I6/V8 (std)Overland n/a |
Laredo I6 (std) Laredo V8 n/aLimited n/aOverland n/aSpecial Edition I6 (std) Special Edition V8 n/aFreedom I6 (std) Freedom V8/V8HO n/aColumbia I6 (std) Columbia V8HO n/a |
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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/aSport 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/aFreedom n/aColumbia n/a |
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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) |
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 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 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 |
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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 4×4 full time ranges can be used at any time and on any road surface. The 4×4 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.
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%)
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-Drive drive system |
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