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have measured the rolling radius and put that in the ratio calc. Mr Ashcroft seems to be right. the flat on the bottom of the tyre caused by the weight of the car is enough to make a big difference to the resulting road speed/revs, which would mean he is right in saying all 4 cylinder 200tdis...

ashcrofts opinion is that the discrepancy may be caused by us not using the true rolling radius, i.e. we should be measuring from the ground to the axle centre and doubling it. I will do this later and see where it gets to on his calc. D ashcroft adamant that 200tdi manual disco 1 has a .77...

HI ricc appreciate the thought but some reasons why I can't do the sensible thing. 1 already spent shedloads welding the thing up, waxoyling, hid conversion, teflon swivels, cvs, etc. did the new heater blower motor myself 2 also replaced fuel tank ( previous owner drilled into it while...

Hi 300 the speedo is roughly 3-4mph optimistic as checked against my garmin, and its definitely an L77 - reverse is on the left. Also Landrover confirm the serial number is as issued when it left the factory. ashcrofts will have an opinion no doubt

thanks james martin I have now checked the diff by your method and it would seem I have the correct diffs at 3.54. Also thanks for the sensible buying advice. thanks thebiglad & 300bhp/ton for the helpful background info which would seem that the 3 of us are right and ashcrofts being...

Thanks for the pointer to the posting article and apologies for the sketchy post, i'll try to improve! James you had the info I need, and I now see I could have got that without asking by looking harder! Many thanks for your patience. FYI The speedo, tho making a frightening noise in cold...

Hi all my discovery1 200tdi is just about to top 200,000 and the gearbox/ t box are on their way out. looking on ashcrofts site they say I should be getting 70 mph at 2500 revs, I'm only getting 60. While Im saving up the money for their fitted recons I'd like to find out why I'm undergeared...

hi everyone. joined up ages ago but this is my first post (I think). got a 200tdi Discovery 1 which is my work vehicle. I have a question for anyone who knows about gearing so I'm off to look for your tech department. :) mike