It's been three consecutive months of bronze for the Chevrolet Silverado. After managing another second-place upset in May, Fiat Chrysler's Ram  is threatening to upend the all-important but usually predictable  pickup battle. A year ago, Chevy launched a brazen marketing assault on  the long-dominant Ford F series, with a series of commercials asserting  that its new aluminum body was too fragile to survive a day at the job  site unscathed.
 Now, with Ford already opening up a 139,000-unit edge over the  Silverado on the year and the Ram on pace for its first half-million  sales year ever, Chevy looks to be the more vulnerable one. Going into  this year, the Ram had only beaten the Silverado in two prior months,  largely due to fluky timing.
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