From the Mega 8000 collection, the 8400 became a favorite, which was especially popular as a contracting machine. After the introduction of the 8050 series, the 8400 was retained in production, but it received a few reforms. Lift force was increased by 7 to a ton. However, the engine represented an older generation than the same one in the powerful 8450. Autocontrol was updated to version 2.1, which had the so-called forced descent function. One secret of the 8400’s popularity was the traffic tractor version, which competitors with speeds of 50 km/h did not have in the mid-90s offer.
In the spring of 2000, the engine was changed to a newer version. The power increased e.g. thanks to the new nozzles to 150 horsepower and the torque increased as much with 105 Nm. The increase in torque was 31% instead of the previous 16%. As standard equipment fire e.g. beefier industrial front axle, bigger tires and longer trailing arms.
In the spring of 2002, the power was further increased to 160 horsepower and became standard equipment came millirings. The engine now had a visco fan. 8400 was also received now as a long wheelbase version. The 8400 was discontinued only after the T Classic models after the presentation.