Jeep uses a array of four-wheel drive and all-wheel drive systems on their assorted vehicles. The makers of the alteration cases are either New Process (NP) or New Venture Accessory (NV) as adumbrated by the archetypal numbers.
Command-Trac (NP/NV-231 or NP-207) was alien forth with the Jeep Cherokee (XJ) in 1984. The arrangement offers a chain-driven, aluminum, "shift-on-the-fly" alteration case. The "shift-on-the-fly" affection provides chiral affluence and abetment while agreeable 4wd. Command-Trac should alone be apprenticed in 4wd on low absorption surfaces due to the advanced and rear axles actuality bound calm (no cogwheel activity in the alteration case). Active in 4wd on dry pavement causes boundless caster & drivetrain wear. 4-wheel modes are best frequently acclimated for wet/slick surfaces or acute acclimate altitude (rain, snow, etc.) (4H), towing (N), and off-road activities (4L).
There are letters of a adapted adaptation accepted as NP-231J HD which was allegedly (SP) a "heavy duty" adaptation for the Jeep Grand Cherokee ZJ with V8 engines. The NP/NV-231 case is a alternation apprenticed assemblage that takes 21 or 23 spline ascribe shafts. The 23 spline was for the AX-15 transmission, and the 21 back was acclimated for the AX-5 and BA 10/5 transmissions. Low ambit for this case was 2.72 and aerial ambit was 1.00
The Command-Trac HD alteration case was acclimated in 6-speed Liberty KJ's from 2005–2007. Although sometimes referred to as the "NV(NP)231HD, " the alteration cases are absolutely the 241 alternation acclimated in full-sized trucks from added makers (241D or 241C). The Jeep adaptation is labelled "NV(NP)241J." This is not the NV241OR alteration case begin in the Jeep Wrangler Rubicon, which uses a 4.0 low ambit & has a able case. Dodge uses a 241DHD which has a able case but the 2.72 low-range. Quadra-Drive active the New Venture Accessory NV247 alteration case. This two-speed chain-driven alteration case uses a gerotor, a clamp backpack accompanying to a hydraulic pump, to alteration torque amid the advanced and rear axles. The alteration case contains three modes, 4-All Time, Neutral, and 4-Lo. In 4-All Time, 100% of torque is beatific to the rear arbor in accustomed conditions. If the rear arbor starts spinning at a college amount than the advanced axle, hydraulic burden builds up in the gerotor and causes the clamp backpack to progressively alteration torque to the advanced arbor until both axles acknowledgment to the aforementioned speed. Neutral approach is advised for towing the vehicle. In 4-Lo, the advanced and rear axles are bound calm through a 2.72 abridgement accessory ratio. Quadra-Drive II offers an uncompromising NV245 two-speed alteration case with Electronic Limited-Slip Differentials (ELSDs) that can advice you "go anywhere, do anything" beneath around any active condition.
The Jeep Grand Cherokee/Commander band no best offers a part-time alteration case option. The acumen abaft this was its poor sales forth with an bigger Selec-Trac. Selec-Trac and a simplistic Quadra-Trac had the accessibility and abundance of "Full-Time" all caster drive that Command-Trac lacked for "luxury" SUV's that did not crave the added asperous part-time system.
