The Disco 3 and Range Rover from 07 use Torsen centre diffs (06 and before Rangies use an open Tosen diff)with a clutch plate locker operated by an electric motor -winding the plates tight against each other - so it can be unlocked or fully locked or anywhere in between - (the dash screen only shows it being either open or locked) - depending on the Terrain Response, gear, throttle, engine load, steering positions.
The rear Diff lock works with a clutch system again - operated with an electric motor - fully locked to open and anywhere in between.
they both work very well - as you climb a hill even before you get any wheel spin the CDL engages (engine/gearbox load sensors) and the rear will lock up instantly when TC kicks in - or when you engage Rock Crawl/Sand.
The transmission (ZF Auto) system is the best ive used - it will go places id struggle to put my 90.
- we asked the engineers when we first got them if there was an exposed bolt head on the Torsen/rear diff you could manually operate with a spanner to lock/unlock if the electric motor went u/s - 'nope' was the answer - and that puts me off using one in remote areas - that and the rest of the electrical gubbins and the fact that it weighs 2.7 tonnes (kerb)......1 ton heaver than a 90 hardtop.
the diffs are quite reliable - we dunked them underwater (in silt laden water)daily and had very few problems with them - unlike the handbrake...
Last edited by Gipper; 24 Jul 2007 at 20:55.