I get this question alot at my shop, When unlocked the power takes the path of least resistance, usually to the rear axle due to less rotating mass in the rear axle. think of it as a full time 4x4 pickup, in unlock the axle with the least amout of resistance gets 90 percent of the power due to less rotating mass IE: shorter driveline to front axle and smaller axle components. Just like the rear on a truck, All that is happening when you lock it up is you are locking both drivelines together, sending equal power to both axles, there is no locking of the wheels together, the next time you get one stuck you will see one tire on each axle spinning when locked, unlocked you will only see one tire on the whole truck spin, the one that has the least amount of traction, It is called an interaxle diffrential, it is exactly that, a differential, just like the one in the rear axle of your pickup, its just laid in there lengthwise instead of cross ways. So your class 8 has three diffs, in the rear axles , hopefully my explantion is slightly clearer than mud, and BTW you are right he is wrong, I have been a diesel mech for 20 years and own my own shop, I work on many of these! so Im not pullin your leg.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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