the Zexel Torsen T-2/Type B differential fitted to the New Venture Gear 225 transfer box in the ‘02-’05 Range Rover 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 however - as Mark has already stated - 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.
