The Toyoace was a renaming of the Toyopet SKB Truck as a result of a 1956 public competition with 200,000 entries.

In Japan, its traditional competitors are the Isuzu Elf, the Mitsubishi Fuso Canter and the Nissan Atlas.

[11][12] The original semi-cab over Dyna was replaced by the new model K170 series in September 1963, with a leaner design with quadruple headlights.

The Dyna RK170 also provided the basis for the RK170B Toyota Light Bus, and was built on the chassis of the Stout.

The H diesel is rated at 95 PS (70 kW) and was only available in the heavier duty three-tonne truck version, which has a top speed of 100 km/h (62 mph).

[18] A heavy duty version called the Toyota Massy Dyna was first introduced in September 1969.

A rebodied version of the U10 Dyna was also sold as the first-generation Daihatsu Delta 1500 or 2000, depending on the weight ratio.

[21] U20, U30, U40 & U50 Series (1977–1984) The U20 is a four-wheel truck (this chassis code was also used for the Route Van), the U30 is a longer wheelbase version, while the heavier U40 and U50 have a wider cab.

In certain export markets, the ToyoAce was sold as Dyna, and offered in single and double cabin bodystyles.

[citation needed] This model was also sold as the Daihatsu Delta, in a range of 1.5 to 2.5 tonne payloads.

Portugal's Salvador Caetano assembled the LY60 Dyna as the 150, using Toyota's 2L engine, a 2.4 L (2,446 cc) diesel inline-four.

Front, ventilated twin piston disc brakes were optional on the first series wide cab Dyna 300.

Exterior changes included new cab designs along with redesigned electrically controlled wing mirrors, new turn signals and new thermo plastic steel steps.

The front suspension was modified and a new liquid sealed cab mount improved ride quality.

Even though they were built on the U300 and U400 platforms, for marketing purpose these models still used the Dyna 100, 150, 200, 250, 300, and 350 names, indicating payload.

The Dyna 100 was available with a 2.5 L (2,494 cc) D-4D common rail turbo diesel engine offering 88 PS (65 kW).

[28] In September 2006, the engines of the 2.0 and 4.0 tonne models were made to comply with the Low Gas Vehicle Emissions regulations.

In October 2006, the Hybrid model was revised for low emissions and was now eligible for tax reductions while the range underwent a facelift.

These vehicles have emission levels which meet the stringent Euro IV requirements which took effect in Europe in 2005, in Singapore in October 2006, and were applied in Japan from February 2007.

Beginning in 2003, Portuguese-made Dynas entered the rest of the European market – hitherto they had only been for local consumption.

[28] In March 2015, Salvador Caetano announced the cessation of Dyna assembly in Portugal, as the truck did not meet the Euro 6 emissions standards and would not be marketable within the European Union.