A face change WOULD resolve the differences...
but with one each in hand ( a 1280 and a 1000) I can tell you...
THEY ARE NOT THE SAME INSIDE!
...now 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
(remember...my 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
http://www.teglerizer.com/mgstuff/ob_description.htm
Rat -'80 Spitfire - fledgling recently left the nest
http://www.teglerizer.com/triumphstuff/spit80.htm
Punkin' - '78 Spitfire - in Superb Shape!
http://www.teglerizer.com/triumphstuff/spit78.htm
Lil' Greenee - '73 RWA Midget - finally home
http://www.teglerizer.com/midgetstuff/index.html
email: wizardz@toad.net http://www.teglerizer.com
-----Original Message-----
From: Kai M. Radicke <kradick1@ic3.ithaca.edu>
To: Phil Bates <jello@ida.net>
Cc: David Councill <dcouncil@imt.net>; MG List <mgs@autox.team.net>
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 -- kradick1@ic3.ithaca.edu
'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
> same OTHER THAN THE INTERNAL GEARING which is
> 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
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