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Do you know what gearbox you have fitted? their will be a marking somewhere on the gearbox casing saying something like, F-10, F-13 or F-15

Once you find this out, you should be able to find out what ratios are being used

I can never remember which way round, but the F-13 and F-15 boxes are interchangeable, one of these is close ratio, and the other is longer. I think the F-15 is the close ratio box, also not easy to get hold of
 
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