Which speedo drive do I need?

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Hard-Drive

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359
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Rugby
My speedo currently over-reads when I compare it to the numbers on the GPS. I understand that if I install a different speedo drive on the transfer box, I can potentially compensate for the changes on the vehicle that are messing things up.

I am running a Disco II transfer box which I think is a 1.211 ratio (slight lower than a Disco I box at 1.222)

I am also running 265/75/16 tyres which obviously make a difference.

What drive do I need, and is swapping it a straightforward job (I had the transfer box in bits on the bench recently but I can't remember if access is easy with the box in situ)

Thanks!
 
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