There is a force that is exerted by the tires which is absorbed and applied to the lower control arms right next to the tire. Thus, no force is exerted on the carrier. If you are thinking that the point in where the lower control arm shackel is affixed to the axle tube is acting as a fulcrum point and that the forward force of the tire is causing the axle to act as a lever pushing the splined end of the axle to the opposite direction, this would be possible of the lower control arms were in the middle of the axle tubes acting like a see-saw. This is not true because the lower control arms are mounted within close proximity of the axle bearing. The torque arm slides freely in the bushing affixed to tranmission allowing the torque arm to slide in and out as the rear suspension goes up and down.
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