continued as the base V8, but the 327 engines were replaced by new V8s of . GM's three-speed Turbo Hydra-Matic transmission, previously only offered on SS-396 Chevelles (RPO M40), was now available on all models with all engines (THM400s were used with the 396 while the THM350 (RPO M38) first introduced with the Camaro and Nova) was phased in with the small blocks optioned, including the six-cylinder and small-block V8s which in previous years were only available with the two-speed Powerglide. A police package Chevelle 300 (pillared 4 door sedan) was available for the 1969 model year which came with the L35 code 396 - it was built in few numbers when the Chrysler Corporation held the market for its law enforcement orders. Some 1964 and 1965 Chevelle 300s came with the BO7 police package but was powered with the inline six. For 1970, the Malibu was initially the only series of Chevelle offered, aside from the SS-396 and new SS-454, as the low-line 300 and 300 Deluxe models were discontinued for the American market (it continued in Canada until 1972), which also eliminated the two-door pillared coupes from the Chevelle lineup – which were never included in the Malibu series. New grilles, rear decks with taillights moved into the bumper and revised Sport Coupe roofline highlighted this year's changes. The standard six-cylinder engine was punched up from to and , while the same assortment of V8s carried over with the addition of a , V8 on non-SS Chevelles. At mid-year, the Malibu was rejoined by lower-line Chevelle models that were simply called the base Chevelle in both four-door sedans and two-door hardtops. In 1971, Malibus and all other Chevelles got a new grille surrounded by single headlamps replacing the duals of previous years, and four round taillights similar to Camaros and Corvettes were located in the bumper. All engines were detuned to use lower-octane unleaded gasoline this year per GM corporate policy as a first step toward the catalytic converter-equipped cars planned for 1975 and later models which would require unleaded fuel. Only new grilles highlighted the 1972 Malibu and other Chevelles. All bodystyles were carried over from 1971, but 1972 would be the final year for hardtops and convertibles as the redesigned Chevelles originally planned for this year, but delayed until 1973, would feature Colonnade styling with side pillars and frameless door windows. The 1972 Chevelle was also