Outer Limits 4x4 Board

Hi All,

Please excuse a newbie for a pretty basic question but if someone could help that would be awesome. I have a 2003 sr5 hilux and would like some detailed information on how the 4x4 system works. Any help would be very much appreciated.

Cheers

The hubs are permanent.

Inside the front diff, there is a sliding spline which can engage or disengage drive to the passenger side axle. This spline is engaged using a vacum solenoid.

So when you press the 4wd button, it pushes the spline over the corresponding spline on the diff end of the passengers side axle. This connects your passengers side axle to the diff centre. Pressing the 4wd button also engages 4HI in your transfer case (making the front tailshaft turn) which gives you 4wd.

When you disengage 4wd (press the 4wd button again) the splin is pushed back off the passengers side axle, disconnecting it from the front diff, and 2HI is engaged in the transfer case.

While your driving in 2wd, the drivers side wheel is turning, which is turning the drivers side axle, which drives the drivers side of the diff, which means your front diff is always turning.


If you shift to low range without engaging the 4wd button, you gain 2wd low range, but i believe the transfer case is still in 4wd, it simply doesnt engage the sliding spline on the passengers side axle. Which means your front tailshaft is being driven, but doing nothing as the diff is simply spinning.

Thanks for the response, this is what i was wondering about:

If you shift to low range without engaging the 4wd button, you gain 2wd low range, but i believe the transfer case is still in 4wd, it simply doesnt engage the sliding spline on the passengers side axle. Which means your front tailshaft is being driven, but doing nothing as the diff is simply spinning.

Cheers Again