Predecessors and Successors
Toyota's GT-Four / All-Trac system was originally released on the ST165 chassis Celica that was only available in Japan. The system used a locking transfer case that was the same as the electric/vacuum system that is found on U.S. All-Trac Camrys. For the 1988 model year when the U.S. All-trac system arrival, the Celica GT-Four / All-Trac had changed the transfer case to a viscous coupling unit.
The ST205 chassis GT-Four in Japan continued to use the same system that was in U.S. Celica All-Trac, and all of the rear differential were upgraded to a Torsen differential.
Read more about this topic: All-Trac
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“No philosopher understands his predecessors until he has re-thought their thought in his own contemporary terms.”
—Sir Peter Frederick Strawson (b. 1919)