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Originally Posted by fredjacksonsan
Full Time leaves the transfer case unlocked, so the front and rear can turn at different speeds.
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After reading and also talking to a certified Chrysler mechanic(buddy) I was told and read what is described as a sensa-trac or traction control(can't remember actual name, I believe this is a GM term) which has nothing to deal with the transfer case or transmission. It relies on the computer, wheel sensors, and Anti-Lock Brake System. When the wheel is starting to slip or spin then the wheel sensors send information to the computer that it is spinning or slipping, which then the computer sends a signal to the ABS system to apply pressure to the caliber through the ABS pump to the specified wheel(s) to regain traction.
The 4WD part-time or full time systems has not change very much for over fifty years and still used on newer vehicles, it is the technology of the ABS that has dramatically improved traction control. Also on older vehicles that people are serious about mudding in without ABS they will have seperate "cutting" brakes. Usually hand operated controls to stop the power being transferred to a certain wheel so the other wheel will get traction.