My wife's 2005 Freelander had an irreparable puncture. Four new Yokohamas had been put on about 15 months earlier and had done about 10,000 miles. The local Yokohama outlet explained that the precise tyre model was no longer made but they said that for a 4-wheel drive vehicle it is recommended that all four tyres are replaced, as if one is a lot newer than the others it can burn out the gearbox. Somewhat surprised I asked if anyone took this advice and was told that quite often they did. In the event the Yokahama dealer managed to get two of the original tyres from a broker, which were put on the rear axle and we used the left over as a spare. Should we have replaced all four tyres, or was the risk to our gearbox being exaggerated?