What is All-Trac? Features and technical specifications

What is All-Trac? Features and technical specifications

All-Trac is a full-time AWD system that was installed on some Toyota cars between 1988 and 2000. It was developed by the Japanese car manufacturer Toyota Motor Corporation in 1986 and was originally called GT-Four. At that time it was considered revolutionary because it featured a locking centre differential. Before then, this had hardly ever been seen in passenger cars.

All-Trac design and how it works

In the first versions of the system, the transmission output torque was fed to the centre differential, which was integrated into the front differential. Power was then distributed equally between the axles. Wheel traction was improved on all surfaces as a result. There was also the possibility to manually lock the transfer case using the “Center Diff. Lock” button located in the cabin. After it had been pressed, the axles were coupled rigidly with each other and the propshafts of the front and rear differentials rotated at the same speed.

Later, a viscous coupling replaced the centre differential.

Cars equipped with All-Trac

Model Production years Trim levels which included the system Engine capacity (l) Engine output (hp)
Camry V20 1988–1991 DX, LE 2 82–140 
Corolla E90 1988–1992 Standard and SR5 1.6 95–125 
Previa XR10 1990–1999 DX, LE 2.4 135
Celica А60 1988–1993 Standard 2 203–205
RAV4 XA10 1995–2000  2 119–129

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