Jeep four- wheel- drive systems - Wikipedia. Jeep uses a variety of four- wheel drive systems on their various vehicles. These range from basic part- time systems that require the driver to move a control lever to send power to four wheels, to permanent four- wheel systems that monitor and sense traction needs at all four wheels automatically under all conditions.
The drive modes are the same as with the Dana 1. Hi, 4. HI PT, and 4. LO PT. The 4. WD modes are not for use on high- traction surfaces such as dry roads.
The NP2. 08 was used through at least 1. More commonly, Command- Trac is used to refer to the NP/NV- 2.
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NP- 2. 07 transfer cases introduced along with the Jeep Cherokee (XJ) in 1. The system offers a chain- driven, aluminum, . Command- Trac should only be driven in 4. WD on low- traction surfaces due to the front and rear axles being locked together (no differential action in the transfer case).
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Driving in 4. WD on dry pavement causes excessive wheel and drivetrain wear. Four- wheel modes are most commonly used for wet/slick surfaces or extreme weather conditions (rain, snow, etc.) (4. H), towing (N), and off- road activities (4. L). There are reports of a modified version known as NP- 2. J HD which was supposedly (SP) a . The NP/NV- 2. 31 case is a chain- driven unit that takes 2.
The 2. 3- spline was for the AX- 1. AX- 5 and BA 1. 0/5 transmissions. Low range for this case was 2. The Command- Trac HD transfer case was used in 6- speed Liberty KJ's from 2. Although sometimes referred to as the . The Jeep version is labelled . Dodge uses a 2. 41.
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DHD, which has a reinforced case but the 2. The Jeep Grand Cherokee/Commander line no longer offers a part- time transfer case option.
The reason behind this was its poor sales along with an improved Selec- Trac. Selec- Trac and a simplistic Quadra- Trac had the convenience and comfort of . This system has the same settings as Command- Trac but instead of locking the front and rear drive shafts together in the . It was used from 1. The AMC Eagle used the NP1. From 1. 98. 1 to 1. The NP1. 29 contained a viscous coupling around an open differential for added traction in slippery conditions.
The NP1. 28 has also been found equipped in select model years, which does not feature a viscous coupling. The NP2. 28 Selec- Trac transfer case is closely related to the NP2.
The only difference is that the NP2. It was used briefly in 1. The NP2. 42 Selec- Trac transfer case debuted alongside the Fuel- Injected 4. L Inline- 6 in the compact Jeep Cherokee in 1.
NP2. 28/2. 29) It is a more common feature in the upscale Limited version and the XJ Jeep Wagoneer, and Dodge Durango models (1. It has a shift- on- the- fly transfer- case like Command- Trac but unlike it, Selec- Trac offers full- time all wheel drive in addition to the part- time 4.
WD of Command- Trac. Full- Time all wheel drive has the ability for the front and rear axles to rotate at different speeds, making driving on dry and wet surfaces possible year- round without shifting back to 2. WD again. It still has the ability to lock the front and rear axles. Other Jeep vehicles used Selec- Trac, for example, the Jeep Grand Cherokee, before being discontinued on that platform in favor of the electronically controlled Quadra- Drive II four- wheel drive system in 2. Selec- Trac uses the New Venture Gear NV2. Selec- trac II also differs with its lack of a part- time 4. WD setting. The first version used the Borg- Warner BW1.
From 1. 99. 3- 1. New Process NP2. 49 transfer case carried the name from 1. New Venture Gear started manufacturing it and it was renamed the NV2. Quadra- Trac was the trade name for the Borg- Warner 1.
It was a chain- drive system introduced in 1. Jeep line which included the Wagoneer, Cherokee, and trucks behind the AMC- specific Turbo- Hydramatic 4.
CJ7s also received the Quadra- trac. This system included a differential to shift torque between front and rear which could be locked with vacuum. The Borg- Warner 1. WD Hi modes in full- time or part- time (locked) modes, while the 1. The Jeep Quadra- Trac was differentiated from the open . It offered the following modes: 4. Hi. FT, 4. Hi. PT, and 4.
Lo. PT. In full- time 4. WD High a viscous limited- slip coupling is used between the front and rear output shafts. Applications: In 1. Jeep introduced Quadra- Trac on the Jeep Grand Cherokee using the NP2. The transfer case utilizes a viscous coupler which provides smooth and efficient four- wheel drive operation on dry surfaces. When a differential in speed occurs between the axles, heat buildup causes the viscous coupler to transfer power to the slower axle. It is similar to several passenger car systems, but with a low- range gear for serious off- roading.
If the rear axle starts rotating at a significantly higher rate than the front axle, hydraulic pressure builds up in the gerotor and causes the clutch pack to progressively transfer torque to the front axle until both axles return to the same speed. In 2. 00. 5 Jeep added traction control and replaced the New Venture Gear NV2.
NV2. 45 transfer case. Applications: Quadra- Trac I.
By excluding these modes it creates a system that requires no driver input. Applications: Quadra- Drive II. Jeep added traction control in 2. ELSD is offered, while the front has an open differential. Applications: Freedom Drive. There are two versions of the basic Freedom Drive system for the US Market, called I and II. Freedom Drive I. This function is an alternate program in the CVT and is not a transfer case function.
FDII also adds hill descent control system, off- road tuned traction control, and electronic stability program. The Patriot with FDII also feature longer suspension travel (all 4x. This enables the FDII- equipped Patriot to wear the . Trail Rated Jeep vehicles are determined by meeting several requirements of off- road conditions including water fording, articulation, and other tests. Applications: For the European Market there is a single version which combines elements of both U. S. The European version is available with either a CVT gearbox or most commonly with a 6- speed manual gearbox and has two settings on the traction control and electronic stability program systems to cater for off- road activity, U.
S. FDII suspension travel and a full- size spare tire. Skid plates and tow hooks are options in the EU, but the hill descent control system is not available. Applications: Active Drive. This system under normal conditions sends all available torque to the front wheels while monitoring the speed of the front and rear axles. If the system detects that the front axle is moving more quickly than the rear axle then the system will send power through the power transfer unit to the rear axle until the speeds are the same. All Cherokees with this system have a raised ride height of one inch.
Active Drive low relies on shorter axle gear ratios while holding first gear in the ZF9. HP transmission to achieve a crawl ratio of 2.
Freedom Drive II. Applications: Active Drive Lock. This four- wheel drive system combined with tow hooks, skid plates, and unique front and rear fascias allows the Jeep Cherokee Trailhawk models to obtain the .
The modes are selected by a dial located near the center console and have five settings: . This system was first offered in the 2. Jeep Grand Cherokee. It also comes standard on all 2. Jeep Cherokees with four- wheel drive and all Jeep Grand Cherokees with a two- speed transfer case. Applications: See also.