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The M247 Sergeant York DIVAD (Division Air Defense) was a self-propelled anti-aircraft gun (SPAAG), developed by Ford Aerospace in the late 1970s. Based on the M48 Patton tank, it replaced the Patton's turret with a new one that featured twin radar-directed Bofors 40 mm rapid-fire guns. The vehicle was named after Sergeant Alvin York, a famous World War I hero.
The Sergeant York was intended to fight alongside the M1 Abrams and M2 Bradley in the U.S. Army, in a role similar to the Soviet ZSU-23-4 and German Flakpanzer Gepard. It would replace the M163 Vulcan Air Defense System and MIM-72 Chaparral, ad hoc systems of limited performance that had been introduced when the more advanced MIM-46 Mauler failed to mature.
Despite the use of many off the shelf technologies that were intended to allow rapid and low-cost development, a series of technical problems and massive cost overruns resulted in the cancellation of the project in 1985.
https://en.wikipedia.org/wiki/M247_Sergeant_York

Part of the problem from recollection was that the Patton chassis couldn't keep up with the Abrams and Bradley when going cross country. A bit of a problem when you're trying to protect them.