The A-904 and A-727, debuting in 1960 and 1962, respectively, are 3-speed automatic Chrysler TorqueFlite Transmissions. In Mopar circles, they have become synonymous with strength, durability, and performance. In fact, 43 years after its first application, A-904s were still found in the Jeep lineup!
"Chrysler A727/A904 Techtran Manual-Revised Edition", 80 Pages, Paperback, Each
While building big horsepower has become easier, putting that power down to the pavement is still quite a challenge. Getting great "bite" involves a lot more than sticky tires and a smoky burnout. The suspension system is being put to work in a way it was never designed to operate. A better understanding of exactly what is happening to the suspension when the car launches from a standing start will assist you in maximizing your car's effectiveness on the street or at the track.
Over the last 40 years, millions of Chrysler, AMC, and Jeep vehicles have used these differentials, propelling these high-performance vehicles to victory on the street, in drag racing, and other applications. Chrysler used the Dana 60 and BorgWarner Sure-Grip high-performance differentials in the Challenger, Charger, Barracuda, Super Bee and many other renowned Chrysler muscle cars. These differentials have been tied to historic powerhouse engines, such as the Chrysler Magnum and Hemi V8s in stock car, drag racing, and other forms of racing, making history in the process. Jeep CJs and Cherokees have used the Dana 44 and AMC 20 and put these differentials under tremendous loads, which often requires frequent rebuilds. After years of use, these differentials require rebuilding, and of course aftermarket suppliers offer ring and pinion and other parts to upgrade these axles.