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Re: Does the OD tranny require a shorter drive shaft?

Subject: Re: Does the OD tranny require a shorter drive shaft?
From: Florrie & Allen Bachelder <>
Date: Tue, 21 Dec 1999 17:51:52 -0400
But we still haven't dealt with the odometer...  Changing the face doesn't
change the odometer.  Also, the physical presence of the odometer rules out
rotating the face to put 60 mph at 12 o'clock.

And I note that both my o/d 73GT and my non-o/d 73B have the same 1280
speedos.  The '76 with o/d has a 1000 speedo.  Also, in any year B you can
eliminate the angle drive with a longer cable - the angle drive doesn't
change anything except your bank balance.  John Twist/Carolyn Robinson did
a big speedo survey a few years ago - anybody recall what they concluded
about this?


>From: "wizardz" <>
>A face change WOULD resolve the differences...
>but with one each in hand ( a 1280 and a 1000) I can tell you...
> over the years there may have been variations in both
>tranny speedo cable drive gears, and the speedo internals...
>...which went together for which years? ...I have no idea.
>I CAN say... my Primrose '73 GT had a 1280 in it with O/D tranny.
>Was this config. original... I have no idea. Who knows what the PO had done.
>When I swapped this tranny out to put it in my Blaze Red '73 GT which had
>a 1000
>speedo in it, I did not change the speedo. Road tests with a friend beside
>me on the highway
>( Blaze GT does have cruise control)  at 70mph the best we
>can figure
>the 1000 speedo was reading correctly  +/- 1 MPH.
>So... all I can think off...for all the variations I can SEE in the speedo
>bodies, and yet
>knowing the later years didn't require a speedo change for O/D and non O/D
>Is it possible/probable that the right angle cable drive gears have
>something to do with
>the later cars not needing a change over?
>Paul Tegler
>OBie - '73 BGT - Daily Driver
>Rat -'80 Spitfire  - fledgling recently left the nest
>Punkin' - '78 Spitfire - in Superb Shape!
>Lil' Greenee - '73 RWA Midget - finally home
>-----Original Message-----
>From: Kai M. Radicke <>
>To: Phil Bates <>
>Cc: David Councill <>; MG List <>
>Date: Tuesday, December 21, 1999 3:05 PM
>Subject: Re: Does the OD tranny require a shorter drive shaft?
>Keep in mind that the 1280 O/D speedometer was not used throughout the
>4-synchro MGB cars with overdrive, in fact I believe it is a 1971-1972
>speedometer only.  What prompted our research into the matter was when a
>coworker's 1971 B was converted to overdrive, and we couldn't find the
>appropriate speedometer anywhere in our stock.  Then Paul Barnes' most
>excellent 1972 MGB with overdrive was used as reference and still after not
>finding any differences, the three of us finally gave up and called
>Nisonger... which is when we were informed that it is only a face change.
>If I venture into work over Holiday break, I'll do a write up or
>something... one month off and I'm already bored 4 days into this vacation!
>Any wagers on how many phone calls the poor receptionist at Nisonger is
>going to get about this?  ;-)  Its an epidemic I tell you!
>BTW, Phil I think the company you mean on the West Coast is CARS... another
>division of Moss along with Nisonger (there are two Nisongers too, the other
>is not part of Moss Motors).
>Happy Holidays,
>Kai M. Radicke --
>'74 Triumph TR6 -- with 1001 spare parts all scattered about
>'66 MGB -- with a 1001% chance of heading for the scrap heap
>> I really can't say definitively if a different speedo is needed
>> or not for a 4 synchro.  For the 3-synchro the gauge is the
>> only about 5% different - a difference that one could come
>> out with from the wrong tires.  Anyhow, like I said, I am not
>> sure with the 4 synchro - but I would suspect the same.
>> If you want to know and don't want to look it up call
>> Noisenger or that place in california (can't remember their
>> name, they both advertise in Hemmings).  Be sure to ask
>> based on year, model  with OD vs. not, and if the internal
>> parts are EXACTLY the same, or just close to the same.
>> Phil Bates

         Allen H. Bachelder  =iii=<
         Sinking Creek Home for Wayward MGs
        49 YT, 57 ZB, 58 ZB, 65 B, 67 BGT, 73 B, 73BGT, 76 B, &...
         New Castle, VA 24127

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