In April 1977, production of the truck version of the fifth generation began. Called the Hijet Wide 55, to draw attention to its wider body and bigger 550 cc engine, this was the first Hijet to reach export markets in any serious numbers. The 547 cc AB20 was a four-stroke, water-cooled two-cylinder unit with a single overhead camshaft and balance axle. Power output is 28 PS (21 kW) at 5,500 rpm, while max torque is 4.0 kg·m (39 N·m; 29 lb·ft) at 3,500 rpm. Export versions, which had to face less stringent emissions requirements, offered 30 PS (22 kW) at the same engine speed and 4.2 kg·m (41 N·m; 30 lb·ft) at 4,000 rpm. The only transmission installed is a four-speed manual with a floor-mounted shifter; export versions could reach a claimed 105 km/h (65 mph) top speed.
The engine is mid-mounted just behind the front axle, and access is gained by simply lifting the front seats. Chassis code is S60, with the succeeding letter "P" signifying a simple pickup bed with one opening flap; "T" for the three-way dropside pickup; and "V" for the vans.
Three months after the introduction of the pickups (in June 1977), a glassed van with sliding doors and also a "panel van" version were released. The panel van was simply a truck with a box mounted on the rear; this version was not exported. For export, a van version without windows or rear seats was preferred. A low floor dropside bed was added in December 1977, and a minor facelift took place in September 1978. The changes were limited to different colored bumpers and headlight surrounds, and a changed metal grille insert featuring a larger "D" logo. All versions were available in either Standard or Super DeLuxe trims, but in March 1979 a comparatively luxurious "Custom EX" version of the light van was added.
In September 1979, the Hijet Wide 55 underwent a more thorough facelift: A new front clip with a single-piece grille was the most obvious change, while inside there was a new more sculpted dash as well as more comfortable seats which received adjustable backs. Production continued until replaced by the sixth generation Hijet in 1981.