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Old 02-18-2014, 12:40 AM   #5
BLK65K10
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Join Date: Mar 2012
Location: Bonners Ferry Idaho
Posts: 1,024
Re: Rear End ID...no really!

The 1/2 ton is stamped on the right front carrier flange. It will be two letters followed by 4 numbers. The letters designate the ratio and the numbers are the day and month made. If yours is original it should MA,MB,MC,MD,ME,MF,MG. which are all 3.90.
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