2/13/2023 0 Comments Laycock overdrive unitAn overdrive gearbox makes use of the PTO mounting on the rear of the transfer gearbox, and is effectively a complete additional gearbox between main and transfer 'boxes. Taller tyres obviously result in higher road speed at a given engine speed. My truck is currently running on 265/75R16 (due to balance problems on my 'normal' wheels). 'Standard' tyre for a roadgoing Ibex is BFGoodrich MT in either 285/75R16 or 255/85R16 sizes. A 1:1.222 gear would result is around 15% taller gearing, or a 1:1.003 gear would give 40% taller gearing. It is possible to fit another of the other common Land Rover ratios. The LT230 transfer box is fitted with 1:1.410 ratio output gear (in high range). Several ways to improve the gearing suggested themselves :. This is pretty hard on the poor old 300Tdi, which red-lines at 4K, not to mention the ears of the occupants. Currently running on smaller than usual tyres (32" instead of the 'standard' 33") means that 70mph is acheived at well over 3000rpm. A recent trip to Scotland (1300 miles round trip) convinced me that the Ibex deserved some taller gearing.
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