According to McNeil, the TA400 is the most durable and productive ADT that Terex has ever produced. Capacity is 38 mt (41.9 ton) and 23.3 m3 (30.3 yd3), making this truck well suited to small mining applications. With a Tier 3 compliant, fuel efficient 336-kW (450-hp) Detroit Diesel Series 60 engine delivering a maximum torque of 1,350 Nm (1,548 ft-lb) at 2,100 rpm through a fully automatic or manual Allison HD4560 planetary transmission and high/low ratio drop box, the truck has a top speed of 60 km/h (37.3 mph), the highest in this size class. Rimpull and gradeability are also high.

Globally, about 30% of the 30- and 40-ton class ADTs are sold to mining, with 70% for construction applications—although in South Africa the split is 50:50 or perhaps more than 50% in mining use. Since the launch of the Terex Generation 7 ADTs in 2002 the company has put 4,332 machines into the field, McNeil estimates. Although global ADT sales were generally very depressed in 2009 there were bright spots, notably South Africa and Indonesia, while stocks of both new and used machines have been reduced, so the launch of the machine at this time, planned some years back, may be better timed than it might first appear.