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The Isuzu Forward is a line of medium-to-heavy-duty commercial vehicles manufactured by Isuzu since 1970, following the earlier TY model which occupied the same slot in the market. All F-series trucks are cab over designs and the cabin comes fully built from the factory. Most models come with a diesel engine; but, some markets get CNG derivatives as well. The F-series is available a variety of cab styles, engines, 4WD or 2WD depending on the market it is sold. While Isuzu's main plant is in Japan, these trucks are locally assembled from CKD kits in numerous countries.

The Isuzu Forward (Japanese: いすゞ・フォワード, Isuzu Fowādo) (also known as the Isuzu F-Series) is a line of medium-to-heavy-duty commercial vehicles manufactured by Isuzu since 1970, following the earlier TY model which occupied the same slot in the market. All F-series trucks are cab over designs and the cabin comes fully built from the factory. Most models come with a diesel engine; but, some markets get CNG derivatives as well. The F-series is available a variety of cab styles, engines, 4WD or 2WD depending on the market it is sold. While Isuzu's main plant is in Japan, these trucks are locally assembled from CKD kits in numerous countries. Most mid-size and big-size models of the truck are distinguishable by a front 'Forward' badge; but the common Isuzu badge is usually used on the rear. Confusingly, the smaller Isuzu Elf (N-Series) has been sold as the "GMC Forward" in the United States and other markets. The Isuzu Forward is among the commercial grade trucks used by the Japan Ground Self-Defense Force for rear line duties.

Isuzu TY (predecessor) Isuzu released the 4-tonne (8,800 lb) TY-series in May 1966. This semi-cabover design was Isuzu's first medium-duty truck. The original engine fitted was the D370, a 3.6 L (3,644 cc) inline-six diesel engine with 100 PS (74 kW). The types were TY20, TY30, and TY40 depending on the length of the chassis. That engine was later replaced by the 4.0 L (3,988 cc) D400 engine with 102 PS (75 kW), accompanied by a change in model codes to TY21/31/41. In August 1967 two 3.5-tonne (7,700 lb) models, TY31(S) and TY41(S), were added. There was also an extra long wheelbase model (available with an extended cab) called the TY51. The TY range received a light facelift in March 1968, including a redesigned grille.

First generation (1970) The first generation Forward (TR) was launched in April 1970, replacing the original TY-series. All of the original models came equipped with Isuzu's D500 diesel engine, a 5.0 L (4,978 cc) inline-six with 125 PS (92 kW). In July 1971 this engine was upgraded to produce 130 PS (96 kW). In September 1972 the Forward received a facelift and a new model code (SBR). The D500 engine was largely replaced with the new 5.4 L (5,393 cc) 6BB1 direct injection inline-six producing 145 PS (107 kW). Only certain lighter duty versions, such as the fire truck, retained the smaller D500 engine. The glowplug equipped 6BB1 had the smallest displacement per cylinder of any direct injection diesel engine in the world at the time and went on to power a large number of the Forward, the Elf, and many other Isuzu vehicles for the coming decades. A variety of weight ranges, bodies, and types were on offer, including a tractor unit and dumpers, on wheelbases ranging from 3.2 to 5.6 m (10 to 18 ft). While most of the first generation Forward range was replaced in August 1975, the lighter short cab versions continued in production as the "Forward S" until replaced by Forward Juston in 1986.