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Command-Trac (NP/NV-231 or NP-207) was introduced along with the Jeep Cherokee (XJ) in 1984. The system offers a chain-driven, aluminum, "shift-on-the-fly" transfer case. The "shift-on-the-fly" feature provides manual ease and assist while engaging 4wd. Command-Trac should only be driven in 4wd on low traction surfaces due to the front and rear axles being locked together (no differential action in the transfer case). Driving in 4wd on dry pavement causes excessive wheel & drivetrain wear. 4-wheel modes are most commonly used for wet/slick surfaces or extreme weather conditions (rain, snow, etc.) (4H), towing (N), and off-road activities (4L).
There are reports of a modified version known as NP-231J HD which was supposedly (SP) a "heavy duty" version for the Jeep Grand Cherokee ZJ with V8 engines. The NP/NV-231 case is a chain driven unit that takes 21 or 23 spline input shafts. The 23 spline was for the AX-15 transmission, and the 21 spine was used for the AX-5 and BA 10/5 transmissions. Low range for this case was 2.72 and high range was 1.00
The Command-Trac HD transfer case was used in 6-speed Liberty KJ's from 2005–2007. Although sometimes referred to as the "NV(NP)231HD, " the transfer cases are actually the 241 series used in full-sized trucks from other makers (241D or 241C). The Jeep version is labelled "NV(NP)241J." This is not the NV241OR transfer case found in the Jeep Wrangler Rubicon, which uses a 4.0 low range & has a reinforced case. Dodge uses a 241DHD which has a reinforced case but the 2.72 low-range.
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 "Full-Time" all wheel drive that Command-Trac lacked for "luxury" SUV's that did not require the more rugged part-time system.
The terms "Command-Trac" & "Selec-Trac" where used in other Jeep lines and refer to different transfer cases in those lines.
- Jeep Cherokee (XJ) 1984–2001
- Jeep Comanche (MJ) 1986–1992
- Jeep Wrangler (YJ, TJ, JK) 1987–Present
- Jeep Grand Cherokee (ZJ) 1993–1995
- Jeep Liberty (KJ, KK) 2002–Present
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SRTs: Grand Cherokee SRT8
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