In my opinion, if you are using the vehicle regularly in of road situations, then a functioning centre diff lock is invaluable. The TC only starts to work once a wheel/wheels has started to spin, and depending on terrain, a spinning wheel will then start to dig creating even more work for the non spinning wheels. Locking the centre diff before negotiating potentially tricky surfaces will help keep momentum and lessen the chance of wheelspin.
Dont get me wrong, the D2,s TC is a great system and very capable offroad, but if you use the vehicle a lot offroad you will definately see the benefits of BOTH systems working together.
Its also worth remembering that the ABS/TC system on the D2 Is well known for causing trouble, and having the CDL is a good back up.

In terms of justifying the cost of the CDL linkage, there is one thing no-one has mentioned yet.

If you have a problem with an axle diff, CV joint, propshaft U/j or similar, if you only have TC then you won't be able drive the vehicle at all. Whereas with a working CDL, you can always take a prop off, select to lock the centre diff and Bob is your mothers best friend you can drive your vehicle home.

As others have mentioned, TC is good but CDL plus TC is better in part because the TC doesn't have to work so hard.


Dave

thebiglad said:

In terms of justifying the cost of the CDL linkage, there is one thing no-one has mentioned yet.

If you have a problem with an axle diff, CV joint, propshaft U/j or similar, if you only have TC then you won't be able drive the vehicle at all. Whereas with a working CDL, you can always take a prop off, select to lock the centre diff and Bob is your mothers best friend you can drive your vehicle home.

As others have mentioned, TC is good but CDL plus TC is better in part because the TC doesn't have to work so hard.


Dave

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Another good point Dave, as the diffs are can be weak on an offroad car.

Tc is great but obviously cdf has been seen as must have item as land rover re-fitted it to the later discovery 2's

Less like to weld the CDL planet gears to the cross pin with the lock engaged too...

JordanTD5 said:

Also with TC, It needs to see a speed differential in the wheels as you said.

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True - I believe the handbook mentions something about a steady throttle, say 1500 rpm, not a total bootful, once you've created the speed differential...

DIFFLOCK66 said:

True - I believe the handbook mentions something about a steady throttle, say 1500 rpm, not a total bootful, once you've created the speed differential...

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I know.

What I was saying is that if you give it too much throttle to get all four wheels spinning. The traction control will assume the vehicle is moving forward and stop braking spinning wheels.

The TC doesn't remove the need for driver skill. A lack of which is the more likely reason the above range rovers were stuck.