I was on Wikipedia and i read the following blurb on the Series 3 section
In 1980 the 4-cylinder 2.25 litre engines (both petrol and diesel) were updated with five-bearing crankshafts to increase strength in heavy duty work. At the same time the transmission, axles and wheel hubs were re-designed for increased strength. This was the culmination of a series of updates to the transmission that had been made since the 1960s to combat the all-too-common problem of the rear axle half-shafts breaking in heavy usage. This problem was partly due to the design of the shafts themselves. (6 cylinder + Rover rear end = broken diff, broken axles). Due to the fully-floating design of the rear wheel hubs, the half shafts can be removed very quickly without even having to jack the vehicle off the ground. The tendency for commercial operators to overload their vehicles exacerbated this flaw which blighted the Series Land Rovers in many of their export markets and established a reputation that continues in many markets to the present day. This is despite the 1982 re-design (mainly the changing of the driveshafts from 10 driving-splines to 24 to reduce stress) all but solved the problem.
Is that correct about the 10 spline shafts being upgraded to 24?