X-frame Vehicle frame
rolling x-frame chassis
this design used full-size american models of general motors in late 1950s , 1960s in rails alongside engine seemed cross in passenger compartment, each continuing opposite end of crossmember @ extreme rear of vehicle. chosen decrease overall height of vehicles regardless of increase in size of transmission , propeller shaft humps, since each row had cover frame rails well. several models had differential located not customary bar between axle , frame, ball joint atop differential connected socket in wishbone hinged onto crossmember of frame.
the x-frame claimed improve on previous designs, lacked side rails , did not provide adequate side-impact , collision protection.
this design replaced perimeter frames.
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