Selec-Trac was first introduced in the full-size Jeeps (SJ) in 1983 using theNew ProcessNP228 and NP229 transfer cases. These are very similar to the Quadra-Trac NP219 transfer case described in the next section below. The differences are 1) they added a 2WD mode for fuel savings and 2) the 2WD-to-4WD modes were controlled via a vacuum switch on the dashboard. The Hi-N-Lo range selection was still performed using a shift lever on the console. The NP228 differs from the NP229 by not having the viscous coupling in 4WD Hi mode, reverting to a simpler open center differential. Both transfer cases still lock the center differential in 4WD Lo mode. The NP228/229 transfer cases were available in the full-size Jeeps from 1983 to 1991. The NP228 was also available in the XJ Cherokee and Wagoneers and the MJ Comanche pickups from 1984 until replaced by the NP242 in 1987. Several companies have offered a dual shift lever conversion which replaces the vacuum switch and solenoid with a more reliable second console lever for 2WD-4WD mode selection.
TheAMC Eagleused the NP119 transfer case in 1980, a strictly full-time all wheel drive model. From 1981 to 1988, a similar system was employed, dubbed "Select-Drive", which allowed the vehicle to switch from all wheel drive to 2WD using the NP129 model transfer case. The NP129 contained a viscous coupling around an open differential for added traction in slippery conditions. The NP128 has also been found equipped in select model years, which does not feature a viscous coupling.
The NP242 Selec-Trac transfer case debuted alongside the Fuel-Injected 4.0L Inline-6 in the compact Jeep Cherokee in 1987. The shifter has modes 2WD - 4WD Hi Part-Time - 4WD Hi Full-Time - N - 4WD Low. There is a center differential that is open in 4WD Hi Full-Time mode and distributes torque 48/52% front-to-rear. This mode can be used on dry pavement or slippery surfaces with only a small fuel mileage penalty compared to 2WD mode. In 4WD Hi Part-Time and 4WD Low, the center differential is mechanically locked, so these modes are for slippery surfaces only. Low range engages a 2.72:1 planetary gear ratio for increased torque and low speeds. Overall, this system functions very much like the NP228 transfer case above, just with all of the mode and range controls via a single, console-mounted shift lever. It was available in the 1987 to 2001 XJ Cherokee and Wagoneer, the 1987 to 1992 MJ Comanche, the 1993 to 2004 ZJ and WJ Grand Cherokees, the 2002 to 2007 KJ Liberty, and the 1998 to 2000 Dodge Durango. It was replaced in the 2005 Grand Cherokee by the Quadra-Trac II system featuring the NV245 transfer case with 4WD Auto mode and in the 2008 KK Liberty by Selec-Trac II using the MP3022 transfer case.
2000 JEEP Cherokee Sport 4.0L XJ 4x4 62k miles XJ4SALE.COM - YouTube
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