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Message: <blockquote data-quote="NXcoupe" data-source="post: 751571" data-attributes="member: 11751"><p>Chryslers in 70 and 71 had a track pack and super track pack. The track pack was a dana rear with a 3.54 rear gear, and some other stuff. The supertrack pack was a 4.10 dana on man and autos and had power disk brakes, stiffer leaf springs biased towards the right rear, and a few other things. It was all stuff made to take the power and abuse of a drag strip. I'm sure that's what the mach 1's that have that decal have had done to them. Probably a rear gear, different springs, etc. But who knows?  Ask one of the owners.</p></blockquote><p></p>