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If you look for my 65/66 restoration guide in a previous post you will find all the information to decode the warranty tag. The rear axle tag is for a 28 spline 3.25:1 open Ford 9". The engine tag is for a 1966 model 352, change level 6. The date code 5L is November 1965 which agrees with the VIN 779287 which places the build date for the truck in November 1965 also. 291 S is the engine code for a 2 BBL 352.