New refinements appeared on the 1965 redesign. The Corsa came standard with an instrument panel featuring a speedometer with resettable trip odometer, a 6,000 rpm tachometer, cylinder head temperature gauge, analog clock with a sweeping second hand, a manifold vacuum/pressure gauge and fuel gauge. A much better heater system, larger brakes borrowed from the Chevelle, a stronger differential ring gear, a Delcotron alternator (replacing the generator), and significant chassis refinements were made. Out back, a new fully articulated rear suspension virtually eliminated the danger of the previous generation's swing axles, and was based on the contemporary Corvette Sting Ray (Corvair used coil springs while the Sting Ray uses a transverse leaf). AM/FM stereo radio, in-dash All Weather Air Conditioning, telescopically adjustable steering column, and a Special Purpose Chassis Equipment ("Z17") handling package, consisting of a special performance suspension and quick ratio steering box, were significant new options for 1965. The Monza and Corvair 500 Sport Sedans were the only compact cars ever available in the U.S. as pillarless four door hardtops.