According to the dealer I bought my landie from at Southern Landrover, it will void your warranty.
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Talked to my Landrover dealer today, and they explained that it would void warranty on any damage directly/indirectly caused by the installation.
For example if a CV or driveshaft were damaged due to the terrain and a locked diff, then it would not be repaired under warranty!
There could be some very grey areas under this policy, but the value of the diff lock/s is probably more than having to wait three years for warranty to run out!
The TCS system has its place, and works very well with soft undulating mounds where the lifted wheel gently spins and the TCS system kicks in.
What doesn't seem right is when tracking up a snotty rocky slope, and having intermittent traction, but not enough loss to wake to TCS system up, then having to spin the wheel more so that rocks are thrown everywhere and the driveline takes working much harder, and then the TCS comes to life!
Pitty, the Landrover doesn't come with mechanical/air lockers as standard.
However I'll fix that myself and just to say that I have been so far very impressed with the new Defender. The anti stall system works a treat, and the ABS system also changes a lot. I really like the newer dashboard, but still find the character and the Defender still very much alive.
My MY13 90 is going on 4000k's and has been brilliant.
Only gripe has been the side intake grill fell off at about 1600km's and one of the rear seats won't fold away.
Puma models are great cars. I only ever see them at work for servicing and problems. I've worked on them in the uk and over here and they still get my vote as a great vehicle.
BUT every vehicle has a purpose. It seems most complaints in regards to them is gear changes and backlash. This is all down to the type of vehicle it is. If you want smooth stuff buy a disco. If you want a bit more raw buy a defender.
Simples :D