What exactly happens when I lock the diff? It is full time 4wd right?, does that mean one front and one rear
until I lock the diff, then all 4 turn equal?
I am new first time rover owner and dont fully understand yet.
99 sd series 1.
thanks in advance.
Mike
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As I understand it. When you "lock" the front and rear together (diff lock) If you lose traction on either front or rear the unaffected end will still give you traction. Example..lose traction on front, the rear will still give traction.

 

Yes by locking the diff you are locking all four wheels together, so basically all four wheels will have the same amount of tourqe. So if you have 100 lbs of tourqe you will have 25 lbs at each wheel. If one wheel is in the air it will just spin.
You can see what I mean by driving in a small circle, then locking the diffs and driving in the same circle, your turning radius will be bigger because all the wheels will be trying to turn at the same speed.
In the unlock mode all four wheels still get power but they can spin at different speeds because they are not locked together.
Just so you know, you must use your diff lock once a month to keep it working. Just put the trans in neutral and run your diff lock lever through all four positions.

 

Lets try and set the record straight, when you are not locked, you have right/rear wheel drive and a small amount to the front axles. When you lock the CDL/t-case, you now have traction to the r/r and the left front and if you start slipping at that point then you basically have 50% of your engines torque to the front diff and 50% to the rear. If you had a D2 with traction control and have reattached your CDL so you can lock up the r/r and l/f wheels and either one of these wheels looses traction, the ETC will shift the power to the opposite wheel on the same axle.
If you want to have equal torque to all wheels you must add some type of locker to both diffs, other wise you will have 2 wheel drive only.

 

So Land Rovers are only two wheel drive? Guess its time to buy a Hummer.

 

Thank you guys, I understand now. So I need to add an ARB locker, should I put one in both axles or just the rear?

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its not really only 2 wheel drive... if you have equal traction on all 4 wheels, all four wheels are driven(aside from a small amout of bias due to mechanical advantage and rotational torque) however since all 3 diffs are open when tbox is unlocked, torque will be sent to the wheel with the lowest moment of inertia (least traction), proportionally, without the use of traction controll. with the center diff locked you always have the same total torque to the front and rear, still applied to the wheel with the least traction on each axle. so with out traction controll, if you have 1 front and 1 rear wheel off the ground, you will not be able to move, even with diff lock engaged.