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OldRide Answers Home Using OldRide Answers Ask a Question   Browse Questions In: AMC Buick Cadillac Chevrolet Chrysler Dodge Ford Lincoln Mercury Oldsmobile Packard Plymouth Pontiac Studebaker Volkswagen Other Makes Classic Trucks  General Topics General Questions Help Identify Classic Car News General Restoration Vehicle Maintenance Site Suggestions & Comments            Search Questions:    gengle24      Did the 12-Bolt rearend come stock with larger coil springs than the 10-bolt on a '67 Impala? I've got (2) '67 Impalas I'm putting together. One has a 12 bolt and the other a 10 bolt. The 12 bolt has larger springs. Did this come factory or has it been added by a previous owner. Thanks in advance for the help. Gregg posted: August 18, 2008       Answers (1)   jswashington      The GM 12-bolt first debuted in 1965 so it might be original, do you have the original build sheet. I stumbled accross this article with some info and pics regarding the 12-bolt rearend. Dont know if it will be of much help but give it a shot! Good Luck. www.chevyhiperformance.com/techarticles/0304_9_inch_12_bolt_rearend_comparison/index.html posted:  August 20, 2008

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