discontinued. Second generation (S35/S36) To maximize cargo carrying space while still staying in the "kei" class regulations, a cabover approach was adopted in 1964, offering buyers the choice between the first generation style or the cabover approach. This generation appearance was also introduced as the larger "New Line Cab" Daihatsu cabover truck (S50, S50T), replacing the earlier L50 New Line. As for its predecessor, it shared its engine with the Daihatsu Compagno. The New Line Cab was built from February 1966 until March 1968. The cabover bodystyle approach appeared after the 1950 Volkswagen Type 2, the 1961 Ford Econoline, the 1961 Chevrolet Greenbrier, and during the same year as the Dodge A100. Third generation (S37) First model change from previous generation saw minor improvements, including rehinging the front doors in the conventional manner as opposed to the earlier rear-hinged doors. The design was boxier over all, with a more wedgy appearance and square headlights in prominent shrouds of a darker colour. The ZM I engine produces at 5000 rpm and was capable of propelling the Hijet (truck or van) to a top speed of . This generation was also offered as an all-electric truck and van. Fourth generation (S38/S40) In September 1971, the fourth generation Hijet appeared, with all-new sheetmetal, initially available only as a truck. The engine remained the ZM 360 cc two-stroke two-cylinder, while the rear suspension reverted to a live, leaf-sprung unit. In February 1972, a new Van was presented, originally marketed as the "Slide Van" as it now featured sliding doors on both sides in addition to a top-hinged tailgate. In September 1974, the front clip and rear bumper underwent light changes to accommodate full-size yellow license plates (hitherto, kei cars had been equipped with smaller plates than normal). In October 1976, the four-stroke Hijet 550 appeared, with the new 550 cc AB20 engine taking full advantage of the recent new kei regulations. Bigger bumpers meant that all Hijets built after this date are slightly longer, as the 360 received the same external changes simultaneously, including a new front clip. To reflect the new engine, the 550 received the new chassis code "S40". In export trim, where it was sold as the Daihatsu 550 Cab and Cab-Van, this engine has at 5,500 rpm, and at 4,000 rpm. The 550 Van had an advantage of a higher carrying capacity than the 360 Van, at 350 rather than