I am familiar with the much talked about mainshaft wear problem on my Defender/Discovery but I don”t know how bad mine is, or if I need to look at replacing my gearbox?

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I am familiar with the much talked about mainshaft wear problem on my Defender/Discovery but I don”t know how bad mine is, or if I need to look at replacing my gearbox?

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The best way of ascertaining the degree of wear is to chock the two front wheels, handbrake off, mainbox in first and jack up a rear wheel. Remove the PTO cover to the left of the handbrake and you will be able to see the gearbox mainshaft in the centre and the transfer case input gear around it. By rocking the handbrake drum you will be able to rock the gear around the shaft thus getting some idea of wear / backlash between the two.

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