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Question:

Where do rear axles get heat from and what causes them to warm up if there just a final drive?

Where do rear axles get heat from and what causes them to warm up if there just a final drive?

Answer:

The span from the ring gear case to the wheels produce a small amount of axle twist when force is applied. Any time force or twist is applied it creates heat within the axle. They're enclosed in a third member housing where hot oil from the ring and pinion can leak buy the inner seals. Cheap light-weight trucks and cars don't have third member seals so the hot ring and pinion oil will splash down the outer axle tubes.
May 28, 2018
They produce heat from the friction from the gears meshing together while running down the road.
May 28, 2018

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