You didn't ask about a '75, you asked about a '78, it's hard to say if those numbers even apply to a '78. '78 FSM says front "tread" is 54", & the rear axle housing measures 54" WMS to WMS. If "tread" is measured somewhere different than WMS to WMS then front & rear are different. If "tread" is measured from the center of the tire/rim & the rim is zero-offset that is also WMS. Part of the reason the fronts "looks" wider is that the fenders narrow towards the bumper & at the same time slope in towards the hood a bit at the top while the bed at the rear is near vertical.
_________________ '78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, rough body, bought new 12/4/78. '87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.
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