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Millions and millions of leaf spring vehicles came out of the factory with track bars. The YJ Wrangler and the older leaf spring Super Duty trucks are the best examples. The need for the track bar on leaf springs comes from using softer and longer springs that provide a better ride, but they also allow a lot side-to-side movement which leads to sloppy handling. You don't see them on many older vehicle because they used stiffer leaf springs and there wasn't as much expectation to cruise 80 mph down the freeway in an old CJ-5 or Ford Highboy with two fingers on the steering wheel.
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