Centre Diff Lock
To Stop Centre Diff Lock being engaged automatically when low range
Toyota deemed that the centre diff would be locked automatically when
low range was selected in it's constant 4X4 80 Series. There are many situations
when this is in fact not desirable. One situation that comes to mind is
when low range needs to be engaged on a hard surface for example getting
a heavy towed load moving on a hill or backing a boat up a driveway. In
these situations if the centre diff is locked transmission line wind up
can occur resulting in considerable strain on running components.
A plug located on the rear of the transfer, in about the 1 o'clock position
looking towards the front of the vehicle needs to be unplugged. It unplugs
in the horizontal plane and has a yellow and blue/black wire attached.
Once unplugged just wrap the ends in some insulation tape to stop dirt
getting into the exposed connections.
Locking the centre diff is now controlled manually, in both high and
low range, by the switch on the dash; a far more flexible and sensible
If you have ABS brakes, you'll need a centre diff