cargo bed is an integral part of the body structure and not removable. However this is not the legal definition of truck in the United States where the Comanche, Rampage and Rabbit were all sold. Two cargo bed lengths were used; one for the seven-foot long-bed model, which appeared first in 1986, and a second, shorter version for the six-foot cargo bed, which debuted for the 1987 model year. Unlike other pickups of the time that used C-channel frames, the Comanche's frame design (called a "Uniframe" by Jeep) under the cargo bed was fully boxed, with a large X structure centered over the rear axle. For strength, the rails were over eight inches deep (top to bottom), much deeper than conventional midsize truck frames (1983 Jeep J-10 full-size truck frame is 6.75 inches at the deepest point). This structure was pioneered by AMC for the 1971 "Cowboy" compact pickup prototype. From 1986 to 1987, the Jeep Comanche grille had ten slots in a similar configuration to the 1984-1987 Cherokee XJ, while from 1988 to 1992, this configuration changed to eight slots to match with the SUV. A new "4x4" badge, similar to those found on the Cherokee and Wagoneer models, was affixed to the upper rear of the cargo box on all the four-wheel drive models. After the Chrysler buyout of American Motors for $1.5 billion on March 9, 1987, designed to capture "the highly profitable Jeep vehicles ... and 1,400 additional dealers", the Jeep Comanche, like the similar Cherokee, received only minor changes. These were primarily to improve reliability and parts interchangeability with other Chrysler-built vehicles. Suspension The Comanche used the XJ Cherokee's "Quadralink" front suspension, with coil springs and upper/lower control arms on a solid axle. It was argued that the coil springs allowed for greater ride comfort and axle articulation during off-road excursions. A track bar (Panhard rod) is used to keep the axle centered under the truck. Modified versions of this same basic suspension system were later used on the 1993-2004 Grand Cherokee, 1997 and newer TJ Wranglers and 1994 and newer Dodge Rams. For the rear suspension, the truck used leaf springs that are considerably longer than the Cherokee's, which give Comanches good load-carrying capacity without creating a hard ride. The standard rear axle was the same Dana 35 used in the Cherokee, except that the Comanche mounted the leaf springs underneath the axle, as