[quote=“FormulaLS1,post:18,topic:24628"”]
How does the Dana60 have less HP draw…If the ring gear and parts are stronger and weigh more…
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An easy way to explain it is like this:
Draw a circle on a piece of paper. This will be the ring gear. Now lay your pen down as if it were the driveshaft/pinion gear, and have the edge of the pen touch the ring gear. IDEALLY, you would want the pinion gear to engage the ring gear at the middle of the ring gear, at the 3 o’clock position. No rear-ends are like this. The 9" pinion gear engages way below, think 4-5 o’clock position, and the 12-bolt is like 4 o’clock position. The Dana60 engages the highest and the physics involved (friction losses) are why it’s less of a draw.