BogMonster Posted January 15, 2006 Share Posted January 15, 2006 Since fitting the 265/75R16s the speedo on my 90 under-reads a bit (it was fitted with 205s when brand new, though the first owner swapped those immediately). So I figured if I fit the speedo drive from a 110 shod with 7.50s, it should be OK, easy enough, off to look for part numbers. ...But... No such thing, according to Microtwat Micromuppet suggests that: - All sender units on all 300Tdi and Td5 vehicles are YBE100530 irrespective of tyre size. - The gears, which were selectable to give speedo calibration on older vehicles with mechanically driven speedos, don't fit the newer vehicles (according to Microclot these gears only do up to WA159806 which is the beginning of the Td5s, so wouldn't suit mine which is a 4A vin number). On older vehicles FRC3312 is a 22 tooth gear for 205R16 tyres and FRC3310 is a 20 tooth gear, which presumably does 7.50R16s, though it doesn't say that. There is also an FRC3311, 21 teeth, not clear what that is supposed to do (90s except a 50LE, don't understand the difference though). No gears at all listed for an XA > vin number, which is what I need - The speedo head is the same on all vehicles, allegedly So what changes the calibration from 205R16s to 7.50R16s??? The speedo on new 110s is accurate with 7.50s on, doesn't under-read like mine, so there must be something different somewhere but the ever useful Micro(&**^%&^(&^%*%^*&^ doesn't seem to give any hints I have never had cause to pull out one of the new type electronic speedo drives and see what is inside, has anybody actually done this, or does anybody know what needs to be changed to correct the speedo please? Or has anybody got a parts catalogue which is actually right maybe the old EPC (don't have that) -- I expect it needs the same sort of gears but not sure..... Ta Quote Link to comment Share on other sites More sharing options...
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