Steyr tandem axle is composed of Steyr drive—through axle and rear driving axle, which is manufactured with Steyr technology. It is suitable for the vehicle of 6 x 4.. 8 x 4.. 6 x 6. It can be used with level balanced suspension system and balance suspension system. It is a satisfactory replacement product of big tonnage heavy—duty vehicle. Axial and inter—wheels differential lock equipments have amounted on the tandem axle to make sure that the entire vehicle is safety and runs reliably and has good passing performance. This double axle is equipped on AUMAN heavy—duty truck series FAW heavy—duty truck series.. DONGFENG heavy—duty truck series besides Steyr vehicles.