If you have introduced items like larger tyres, diff locks or even more power it is important to increase the strength of the drive line to decrease the risk of component failure but more importantly increase the safety of the vehicle for its passengers.
If you a serious Off Roader then your best option is for a Locking Differential to give you optimum performance.
The locking differential fits into the centre of your standard differential and adds an electric, pneumatic or hydraulic mechanism to lock the two output pinions together. The Locker when activated will make both wheels will spin at the same speed, so if one wheel is off the ground the other wheel won't know or care and both wheels will continue to turn at the same speed as if nothing had changed. When unlocker, for example, on the road, the differential behaves as a normal open differential giving equal torque to each wheel, whilst allowing the differential action.
There are two types of Locking Differential, driver operated and automatic.
We are able to offer the Ashcroft Locker . These are the driver operated lockers and are activated by a switch in the cab and will also require an on board air supply. The benefit of this type of locker is that it gives you 100% lock up when required and that the driver has total control.
The automatic Locking differential (which should really be called an automatic unlocking differential) is locked whilst both wheels are turning at the same speed, e.g straight ahead on the road. The locking/unlocking occurs when cornering and the outer wheel travels faster than the inner wheel, this increase in speed causes an internal mechanism to release drive to that wheel. At no time can a wheel be driven faster than the differential centre, the only possibility is for the wheel to free wheel faster than the differential centre. The advantage is there is no external operating source required and does not rely on driver input. The disadvantage of this it is not under driver control, on road this can cause some peculiar handling characteristics as wheels alternatively lock and unlock when driving round bends or corners. This locking and un-locking in some designs, e.g the Eaton locker, of automatic locking differentials can be the cause of noise/backlash
Depending on what type of off roading you do you may also want to consider a limited slip differential usually find these are best suited to the faster rally raid events and also the customer that does less severe off roading and doesn't really require a full 100% locking.