of the car. Fenders became squared off and the headlight shells were streamlined. Overall height was reduced by while keeping the same interior space. A new carburetor and revised camshaft raised engine horsepower to 130. The engine also received a new intake manifold, oil pump, cooling system, and a quieter overhead valve mechanism. A Formal Sedan, featuring a roll-down glass partition between the front and rear compartments, was added to the Roadmaster line for US$1,641 ($ in dollars ), of which 452 were sold. The price of the sedan was raised to US$1,518, and that of the phaeton to US$1,856 ($ in dollars ). Overall Roadmaster sales increased to 16,129. 1938–1939 Styling changes for 1938 were modest, with a longer hood extending to a now nearly vertical grill, taller bumper guards, and redesigned hubcaps. Changes were made to both engine and chassis. The ride was improved by replacing the rear leaf springs with coil springs and incorporating double-acting shock absorbers that were four times the size of others. The frame X-member was changed from I-beam to channel construction and all wood structural elements were replaced with steel. The engine combustion chambers were redesigned and new "turbulator" pistons raised the compression ratio from 5.9 to 6.5:1, resulting in an increase in horsepower to 141. The 4-door convertible phaeton changed from the built-in trunk design to a "fastback" rear appearance. The Limited continued to be offered, and a new fastback sedan was added to the line with 466 being sold. The Roadmaster sedan price was increased to US$1,645 ($ in dollars ). The overall automobile market decreased for the year, but Buicks share increased even with Roadmaster sales falling to 5,568 and now making up 3.3% of Buick's total output from its previous 7.3%. Styling for 1939 featured a new two-piece “waterfall” grille with thin vertical bars. The hood was narrower, front door pillars were narrower and hubcaps were larger. The window area increased substantially with the rear window changing to a one-piece design. All the major gauges were relocated directly in front of the driver and the gear shift was changed to a steering column mount. The 4-door phaeton could now be ordered with the built-in trunk appearance or as a fastback, but only three of the latter were sold. Although prices were reduced to US$1,545 ($ in dollars ), sales only rose to 6,097, with Roadmaster's share of Buick's total