Contemporary theories of stress have been used to inform the definition of work-related stress. There is a growing consensus around the definition of stress as a negative psychological state with cognitive and emotional components, and its effect on the health of both the individual and the organisation.
Late 1986, but didn't go into full effect until 1987. Chrysler bought the jeep from what was then AMC American Motors Corporation. They did continue to use AMC parts until the stock was depleted. AMC was purchased by Chrysler in 1987, the first year of the YJ (square headlight) Wrangler.
The Powertech 2.5L four-cylinder returned in the Jeep TJ, carrying its 1984 AMC heritage though with horsepower tweaked up slightly. The 4.0L of previous Jeeps returned to the TJ with its Mopar engine management system. Fuel economy for the best rendition of the TJ 4.0L I6 is 15 city/18 highway MPG. The AMC 2.5L engine was replaced in the Jeep TJ with the Mopar 2.4L engine in 2004. This engine was originally developed for release in 1994 Chrysler small van and car products. This aluminum head, DOHC engine features a different bellhousing bolt pattern than the previous 2.5L.