Umm, can't you just switch the speedometer drive gear in the transmission
instead? They're a little expensive, but they have got to be cheaper than
this. I seem to recall $36 and $72, offhand, for the two tooth-count
variants.
FWIW, putting an LH OD tranny in my 66, I calculated the error, factoring
in tire size, at around 6%, and decided I could live with that.
Phil had this to say:
>Forgot to comment on that. The OD speedo is hard to come by in the US.
>They can
>be had - mostly from MG breaker yards - and they can be rebuilt, but it
>will take
>quite a bit of tracking them down, and you want one from the right series
>of car
>(i.e. an OD speedo off a 68 is not the same as an OD speedo off a 62-67).
>Also,
>you could have your std. speedo rebuilt to OD gearing - which is something
>like
>10% different (if I remember correct 1166 rev/mile std, and 1040 rev/mile
>for the
>OD) - Nisonger in Marmarneck, NY (sp?) does a very nice job with this (the
>usual
>disclaimers apply - I don't work for them, and I don't own stock, just had
>positive experiences with them). Then the only thing that would make it look
>unoriginal would be the numbers on the face of the speedo - all the rest
>looks
>identical.
>
>Can you tell I did this exact conversion??
>
>Phil Bates
>
>Mgbbob@aol.com wrote:
>
>> Hi again listers,
>> Can anyone comment on the need for an overdrive speedometer for the D type
>> conversion I'm about to make? If I left the old non overdrive speedometer
in,
>> would speed be grossly off?
>>
>> While they're not available though Moss, is it imperative that I search one
>> out?
>>
>> Does anyone have the appropriate Smiths numbers for my 66 MGB? Does anyone
>> have a spare speedometer they want to sell?
>> TIA, listers
>> Bob Stahlbush
>> 66 MGB GHN3L 78708
>> 60 TR3A TS 81398L
>
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