A34 Super Track Pak is the package: a 4.10-geared Dana 60 with Sure-Grip, heavy-duty engine cooling, and power-disc front brakes, mandatory with manual transmission. It was the most aggressive factory rear-axle option and turned an otherwise reasonable Super Bee or Road Runner into a quarter-mile-first, Friday-evening-second car.
Famous Lynch Road quirk: A34-equipped cars built at Lynch Road frequently do NOT carry the A34 callout on the broadcast sheet or fender tag. The plant used the upper '084' axle stamping in lieu of the option callout. If a Lynch Road sheet shows 4.10 in the axle row but no A34 in the option block, that is plant-correct, not missing-equipment evidence. Plenum's plant overlay handles this.