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  • Jeep Grand Cherokee (WJ)


    Unveiled at Detroit, MI Cobo Hall on June 16, 1998, the redesigned WJ 1999 Grand Cherokee shared just 127 parts with its predecessor (mostly fasteners) and took 28 months to develop from its March 1996 design freeze (styling approval in Q3 1995). The spare tire was relocated from the side of the cargo compartment to under the floor. The two heavy pushrod V8 engines were replaced by Chrysler's then-new PowerTech. New V8 engine produced less torque than the old pushrods, but was lighter, offered better fuel economy, and provided similar on road performance figures (the 23-gallon fuel tank was replaced with one of a 20.5-gallon capacity). The Inline 6 engine was also updated for MY1999. A redesign of the intake manifold added . While other Jeep vehicles used the Mopar 5 x 4.5 bolt circle, this was the first Jeep following the 1987 Chrysler buyout to receive a wider wheel bolt pattern: – 5 x 5 - (metric 5 x 127mm). A notable feature available in this generation was the automatic four wheel drive option called Quadra-Drive, which employed the New Venture Gear NV247 transfer case. This two-speed chain-driven transfer case uses a gerotor, a clutch pack coupled to a hydraulic pump, to transfer torque between the front and rear axles. The transfer case contains three modes, 4-All Time, Neutral, and 4-Lo. In 4-All Time, 100% of torque is sent to the rear axle in normal conditions. If the rear axle starts spinning at a 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. Neutral mode is intended for towing the vehicle. In 4-Lo, the front and rear axles are locked together through a 2.72 reduction gear ratio. The NV247 transfer case is mated to front and rear axles containing Jeep's Vari-Lok differentials. Vari-Lok differentials also use a gerotor to transfer torque between the wheels on either side of the axle. The major advantage of Quadra-Drive was that the combined transfer case and progressive locking differentials in each axle could automatically control traction between all four wheels. However, only the center differential could be permanently locked, and only in 4Lo. The Quadra-Trac II system included the NV247 transfer case with the standard open front and rear differentials. The 45RFE and 545RFE automatic transmission in the WJ was notable. It included three planetary gear sets rather than the two normally used in a four-speed automatic. This gave it six theoretical speeds, and it would have been the first six-speed transmission ever produced in volume, but it was programmed to only use five of these ratios. Four were used for upshifts, with a different second gear for downshifts. Although five of the six ratios were used, Chrysler decided to call it a "4-speed automatic". In 2001, the programming was changed to make use of all six ratios. Rather than have six forward gears, the transmission was programmed to act as a five-speed with the alternate second gear for downshifts. The rpm at on a 545RFE is 2000 rpm, 200 rpm less than the 45RFE programming. 1999 and 2000 model year WJ owners can have their 45RFE transmission's programming flashed to enable the extra gear as both transmissions are physically the same. The 42RE 4-speed automatic remained the transmission for the Inline 6 engine. It had slight changes from the previous model Grand Cherokee. The interior was also completely redesigned. The redesign allowed for larger rear doors, and more space for rear passengers. Controls for various items like headlights, heated seats, and rear wiper were moved to more convenient locations. The electronic Vehicle Information Center was moved from below the radio to above the windshield, and was standard on all 2000 and up models. Limited models included automatic dual-zone climate control. A 10 CD-Changer was also available with the Infinity Audio package. In addition to Jeep's UniFrame construction, Daimler Chrysler partnered with Porsche to further strengthen the frame. This was done to reduce NVH (noise, vibration, and harshness). UniFrame is an unusual construction scheme, it incorporates all of the strength and durability of a body-on-frame construction into a unitized construction. By adding stiffness and rigidity to the structure, they enhanced the ride and strengthened the network of steel beams, rails and pillars (or "safety cage") that surround and protect occupants. More than 70 percent of the underbody is high-strength steel. All Jeep Grand Cherokees feature UniFrame construction. The Grand Cherokee received a secondary minor facelift for 2004 including round fog lamps, a lower front fascia and a new body-color matched inset grille design. Export models produced at the plant in Graz, Austria, were given the vehicle designation of "WG".

  • Jeep Cherokee (SJ)


    See also Jeep Cherokee for other models using this name1974 Jeep Cherokee, base model Wide-track Jeep Cherokee 1983 Jeep Cherokee 2-door The SJ series Jeep Cherokee is a full-size SUV that was produced from 1974 through 1983 by Jeep. It was based on the Wagoneer that was originally designed by Brooks Stevens in 1963.

  • Jeep Cherokee (XJ)


    The Jeep Cherokee (XJ) is a compact sport utility vehicle that was manufactured and marketed by Jeep in the USA from 1983 to 2001, as well as in other countries, and sometimes under other names, until 2014, with Jeep selling almost 3 million units between 1984 and 2001. Sharing the name of the original full-size Cherokee SJ model, the 1984 XJ Cherokee was Jeep's first all-new vehicle design since the 1963 SJ Wagoneer, from which the '74 SJ Cherokee had been derived. Instead of the traditional separate body and chassis, the XJ featured a light-weight, compact and space-efficient, integrated body and frame design, The models were originally marketed as Sportwagons and became the precursor to the modern sport utility vehicle (SUV) as that term was not yet in use. The XJ spawned competitors as other automakers began to notice that this Jeep design began replacing regular cars. It also began to supplant the role of the station wagon and "transformed from truck to limousine in the eyes of countless suburban owners." The XJ is a "significant link in the evolution of the 4x4.

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