Join Date: Jan 2002
Location: Boise Idaho
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Re: 2wd low
I disagree with Scott_CJ8. I think this is a common Urban Myth. My logic is as follows:
With both front wheel hubs in the free wheel mode (they are unlocked), and the front axle has been engaged at the transfer case, the front differential now rotates. However, the front differential is not under any load, that is to say its not preforming any work. It just spins merrily along just like your 140 amp alternator does when your driving in the daytime and not using any lights, air conditioning or stereo amps.
Of course this additional rotating mass is consuming Horse Power from the engine. The differential is a sealed and lubricated unit so I don't see a problem there with no work happening, the differential is about ready to fall asleep. The same situation occurs when the front hubs are locked, but the transfer case is in 2 wheel drive. No work is being preformed, but it is consuming engine HP because of the drag caused by rotating the axles, front driveline and differential. Most 4x4 military vehicles (m38a1, M151, GammaGoats, M35 series, etc) do not come with lockout hubs, the front differential is always spinning, as are many All-Wheel-Drive cars.