inchman Posted August 8, 2009 Share Posted August 8, 2009 hi, i got my first spin last night in my 90 since the engine /gearbox swap. ( gone from 2.5 td lt77 to discovery 300tdi auto box and transfer box) . It seems nipper already and when kicked down it really takes off. my question is, i removed the speedo sender from the drive and put the cabel in. Is my speedo reading near enough the right speed ? cheers Gary Quote Link to comment Share on other sites More sharing options...
mickeyw Posted August 8, 2009 Share Posted August 8, 2009 hi, i got my first spin last night in my 90 since the engine /gearbox swap. ( gone from 2.5 td lt77 to discovery 300tdi auto box and transfer box) . It seems nipper already and when kicked down it really takes off. my question is, i removed the speedo sender from the drive and put the cabel in. Is my speedo reading near enough the right speed ?cheers Gary It depends how big your tyres are. The Discovery would have had 205x16 or 235/70x16. If you tyres are larger than either of these your speedo will be under reading. There are a range of transfer box speedo drive gears to suit different tyre sizes. If you post up with your tyre size I'm sure one of the tech gods will be able to tell you which gear you need. Quote Link to comment Share on other sites More sharing options...
western Posted August 8, 2009 Share Posted August 8, 2009 speedo drive gears Quote Link to comment Share on other sites More sharing options...
DaveSIIA Posted August 8, 2009 Share Posted August 8, 2009 As above, if you have 205R16 or 235/70R16 tyres on your 90 then the speedo will be geared correctly. If running 7.50R16 or 235/85R16 tyres then you will have to replace the speedo drive gear in the transfer box with a blue gear (probably from your old transfer box). Other gears are available - there is a thread on here about part numbers, number of teeth, gear colour, etc which the search function should throw up. Quote Link to comment Share on other sites More sharing options...
mickeyw Posted August 10, 2009 Share Posted August 10, 2009 I'm running 265/75x16 BFGs. I have the green 21 tooth drive gear and the speedo reads spot on. Quote Link to comment Share on other sites More sharing options...
western Posted August 10, 2009 Share Posted August 10, 2009 as another example, my 110 runs 255/85x16 MT's with the blue frc3310 drive gear in the 1.410 transfer box & my speedo is near enough spot on too. Quote Link to comment Share on other sites More sharing options...
streaky Posted August 11, 2009 Share Posted August 11, 2009 You could try comparing the speedo reading with that shown on a GPS or Tom Tom device? make sure you do it on level ground though or the reading will be inaccurate. Quote Link to comment Share on other sites More sharing options...
ashtrans Posted August 11, 2009 Share Posted August 11, 2009 Hi, just fit the old defender drive gear and it will stay true, Quote Link to comment Share on other sites More sharing options...
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