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Old 01-20-2021, 06:07 PM
little_joe little_joe is offline
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Join Date: Aug 2020
Posts: 53
little_joe will become famous soon enough
little_joe little_joe is offline
Member
 
Join Date: Aug 2020
Posts: 53
little_joe will become famous soon enough
On those transfer cases without a center differential, 100% of power is transmitted from the transfer case rear output via driveshaft to the rear axle while in 2WD. 0 power is directed to the front output.

When one pulls the lever to engage 4WD, whether 4 Hi or Lo, 100% of power is transmitted via both transfer case outputs - to the front diff and to the rear diff. This is done by engaging a gearset in the transfer case to power the front output (and remember the rear output is engaged 100% of the time). There is no "split," it's not some percentage - the outputs are locked together, like when an air/e-locker in a diff is activated. Via the gears (and chains) in the t-case, power is applied equally and wholly to front and rear.

The center diff does allow some percentage of power to be applied to both outputs, and depending on model/mfgr this percentage can be static or transition as needed - e.g. when slippage is detected. When you engage the center diff lock, you eliminate this feature as 100% of power is supplied to both outputs ("diff" outputs are locked together).

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Having owned numerous vehicles with center diff - the V8 4R, GX, FZJ80, old Discovery, Subarus - each mfgr biases them differently. Some may bias power toward the front until slippage is detected, then they can transition power rearward, for example. Some may be static, where they send say 60% to the front and 40% to the rear in normal conditions (my Disco was alleged to be 40F/60R on normal surfaces). We even had a Honda CRV that biased 100% to the front in normal driving, and sent some power to the rear while in snow and sand when slippage was evident.

Whether you like 2WD/RWD vs full-time AWD is purely personal preference. I love the feature, and am completely happy with the tradeoff of lower mpg and more maintenance for AWD and the ability to lock the center when needed.
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