Paul, if you are running a standard 3.89:1 diff than you need the 1280
speedo. Been driving a spit like this for three years and I know it is
correct. The only reason you would need a different speedo is if you have a
different differential. Remember the speedo cable connects directly to the
output of the tranny, after any change has been made by the overdrive. In
simpler terms it gathers its reading straight from the output shaft of the
tranny, and does not care if the tranny is a 4 speed or O/D. I assure you
most certainly that for a car with a 3.89:1 diff (the only reason your
speedo would need changed) the 1280 speedo is correct.
Patrick Bowen
-----Original Message-----
From: wizardz [mailto:wizardz@maxinter.net]
Sent: Monday, July 10, 2000 8:18 AM
To: Bowen, Patrick A RP2; david_schenck; spitfires@autox.team.net
Subject: Re: O/D transmission install
Sorry to spoil your beliefs...
but I can guarantee you there are different gear ratios
floating around out there that were used on the J type O/D
There are 1280 and 1000 rev to a mile variations that I know of
and have used. Before the swap, my speedo read 26mph
while my pace car said we were doing 45mph.
With the present 1000 speedo and J type O/D at 40mph I now read 40.
:-)
Paul Tegler wizardz@toad.net http://www.teglerizer.com
----- Original Message -----
From: "Bowen, Patrick A RP2" <PABowen@sar.med.navy.mil>
To: "'wizardz'" <wizardz@toad.net>; "david_schenck"
<david_schenck@email.msn.com>; <spitfires@autox.team.net>
Sent: Sunday, July 09, 2000 11:07 PM
Subject: RE: O/D transmission install
Paul, I have done this conversion many times. There is no difference in the
speedometer! The one that is already is the correct one. To show the
point, if you are in fourth gear your tach and speedo will match on both a 4
speed and overdrive tranny. If you have changed yours, than I am afraid it
is now wrong.
Patrick Bowen
-----Original Message-----
From: wizardz [mailto:wizardz@toad.net]
Sent: Sunday, July 09, 2000 12:12 AM
To: david_schenck; spitfires@autox.team.net
Subject: Re: O/D transmission install
Yes...it's a straight bolt in. I just did mine last weekend.
You need to also grab the tranny rear mount plate that bolts to the chassis,
the speedo cable is different as is the speedometer (1280 revs per mile vs
1000 per mile)
and don't forget the wiring .
Paul Tegler wizardz@toad.net http://www.teglerizer.com
-----Original Message-----
From: david_schenck <david_schenck@email.msn.com>
To: spitfires@autox.team.net <spitfires@autox.team.net>
Date: Saturday, July 08, 2000 11:09 PM
Subject: O/D transmission install
>
>List,
>
>My non o/d transmission is a little funny and I am thinking of putting in
an
>O/D replacement if I can find one reasonably priced. Is it as simple as
>pulling the old non o/d unit out and popping in the new unit or are there
>other modifications that need to be made?
>
>
>
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