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This paper aims at analyzing the ways the power loop magnitude varies within the 4x4, inter-axle transmission of and automobile, according to different parameters. More accurate, it aims at determining the way the power loop magnitude varies according to the variation of the tire radii difference between the front and the rear axle. To achieving the paper’s goals, a set of specialized tests has been developed, using a military APC with a 4x4 driveline. The dedicated vehicle was the reconnaissance vehicle TAB C-79. To reveal the power loop between the axles, we needed to measure the torque and the angular speed within different relevant spots of the driveline. Specialized sensors have been used together with a GPS VBOX Mini equipment. The experimental results have been illustrated within a series of charts providing the power loop’s magnitude time history in different situations. A complex analysis of these data led to useful scientific conclusions. As a novelty, this paper presents a set of conclusions concerning the power loops when the vehicle was rolling on a concrete surface. We cold say that this paper clarifies the way to determine the power loop occurrence and also its magnitude within the trans-axle transmission when taking into account various factors. Moreover, the conclusions can be used to identify the necessary measures to be taken to diminishing the power loop at the longitudinal level of the automobile’s driveline.

power loops; all wheel driven transmission; rolling radius; inter-axle differential