Early L322s used the New Venture Gear NV225 transfer box (i.e. petrol models to 2006MY and diesel models to 2007MY, both with 5-speed transmissions). This transfer box was unique to the Range Rover and wasn’t used in any other vehicle.
Once the 6-speed transmission was introduced, all models were fitted with the Magna Steyr DD295 unit. This box was also used in the LR3/LR4 and Sport models, and is still being fitted by Land Rover to this day.
The New Venture box featured a Torsen T-2/Type B centre differential
which is a TORque SENsing device with a torque bias ratio of around 1.85 i.e. it can distribute torque within the range 65/35 front to rear, or rear to front, though of course it’s nominally 50/50 during normal driving conditions. A big advantage of the Torsen arrangement is that it doesn’t rely on one set of wheels to slip before it is activated i.e. it is designed to be a preventative system which does not require a speed differential to function. Unfortunately, as many of us found to our cost, if the front propshaft lets go completely (i.e. spline failure) it can only transmit 1.85 x front propshaft torque to the rear propshaft = 1.85 x zero = a big fat zero.
The Magna box, on the other hand, has an electronically-controlled centre differential which can be locked through engaging (or partially engaging, if torque biasing is required) a multi-plate clutch pack.
Phil
Surely with a front prop failure that would be the same as no traction so the electronic control would use the clutch to lock the diff?But they both give the same effect if prop U.S.
No forward motion = No electronic control as it don’t know what’s going on?
Its a question not a statement
J
Where does the control come from?
My comment was also framed as a question.
Ask me what old pal
What happens to a disco, same platform drivetrain with no drive to the front wheels?
Oh sceeene
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