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Transfer box ratios


gelf
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for a 200 tdi Auto running on 35" tyres what ratio transfer box is best.?

This is high range as low ratios seem to be the same......... 1.003, 1.222, 1.410 or 1.667

just looking at giving the disco its road legs back.

thanks

Graham

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Standard Discovery high range should be 1.222 so I should think a 1.410 would do the trick.

Remember the circumference is proportional to the tyre diameters (because rolling circumference = pi x diameter) so if the standard tyres are about 29" (205R16 or 235/70R16) then you want a ratio:

35/29 x 1.222 which is 1.474:1 to give the same gearing.

Other factors like rolling resistance of the tread pattern will make a difference but 1.410 would be my choice in that situation, it will be a little higher geared than standard but probably still bearable :)

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