Your top gear is 1:1 right now and would be 0.82:1 in Top O/D with a
4-synchro box. In top you should be seeing 3910 rpm currently, and you
will see about 3167 with the overdrive (using factory mph/100rpm ratios
of 17.9 and 22.1 respectively).
British Automotive www.mgbmga.com has an excellent writeup on swapping
in the overdrive trans. Since you already have an all-sync trans in
your early car, it should be a direct swap, with a little bit of wiring
but no additional bodywork.
Having done a LOT of long distance driving in my MGB, I definately
recommend the overdrive.
Word on the street is Kevin D. Richards said:
> Just a couple of questions to the wise ones:
> I am contemplating adding an overdrive to my 64B.
> Right now, it has a four synchro box in it and it is great...nice and smooth,
> I am moving and will have to do much highway driving...
> what is the difference in revs at highway speeds.
> Let's say, what is the exact rev number for a 1800 with a 4 synchro box at
> and the same with a late overdrive installed?
> Will the late four synchro overdrive box fit right in, or will I have to
> modify the tunnel?
> thanks so much for any answers.
> PS, anyone have a good overdrive they want to sell?
1966 MGB - GHN3L Safety Fast! __,__\__
The MGB Experience www.mgbexperience.com (_o____o_)
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