Chevrolet Universal Series AD 

Production period:	1930
Class:	Motor Car
Body versions:	Phaeton, Roadster, Sedan, Coupe, Cabriolet
Engines:	Gasoline engine: 3.2 litres (34 kW)
Length:	3962 mm
Wheelbase:	2718 mm
Curb weight:	994-1207 kg
previous model	Chevrolet International Series AC
successor	Chevrolet Independence Series AE

The Chevrolet Universal Series AD was a car range car that was only produced by Chevrolet in 1930 as the only model and successor to the International Series AC. The vehicle was introduced in January 1930 and was available with ten different bodies - six two-door and four four-door. This 1930 Chevrolet 4-door Sedan was known as the
Universal Series AD. It was very similar to the 1929 International Series but did come with hydraulic shock absorbers.  

The cars had the top-controlled six-cylinder in-line engines (OHV) of the predecessor. The 6-cylinder engine with 3179 cc capacity developed a power output of 46 hp (34 kW) at 2600 rpm.The Chevy six was developed by engineer Ormond E. Hunt, who took his cue from an earlier design by Henry M. Crane and which had evolved into the 1926
Pontiac. The Chevy power plant used the same 3.75- inch stroke as the Pontiac, but a larger 3.31 -inch bore. This gave it a displacement of 194 cubic inches, and by
1930 this unit was producing an even 50 horsepower. With certain improvements over time, this solid over- head-valve engine remained the standard Chevy power piant for nearly three decades.The engine power was transmitted via a single-disc dry clutch and with a manual three-speed gearbox to drive the rear wheels. For the first time, all four wheels had mechanical drum brakes.

The selling prices had fallen to the level of the pre-predecessor national and lay between 495, - and 685, - US $. After just 10 months and 864,243 copies, Chevrolet discontinued Universal in favour of the new Independence AE series.