I also heard once that the O/D uses a different drive shaft
James Nazarian
71 B Roadster
71 BGT
63 Buick 215
"Aerodynamics are for people who cannot build engines"
Enzo Ferrari
----------
> From: Bill Schooler <schooler@erols.com>
> To: Trevor Boicey <tboicey@brit.ca>
> Cc: Enrique Claure <spanlab@ceibo.entelnet.bo>; mgs@autox.team.net
> Subject: Re: Adding over drive
> Date: Thursday, October 12, 2000 6:15 PM
>
> Whenever this question is asked, and answered, everyone seems to always
forget
> one critical part that is NOT internal. The rear extension on the
standard
> gearbox is replaced with an overdrive adapter that goes between the
overdrive
> unit and the main gearbox casing. Now where are your going to find an
> overdrive adapter unless you have an overdrive gearbox to start with?
(Not
> even shown in a Moss catalog.) I admit that I've not actually tried to
find
> this piece for sale, but I have a strong suspicion that it isn't
available
> standing alone.
>
> Bill
>
> Trevor Boicey wrote:
>
> > Enrique Claure wrote:
> > >
> > > Hi list, is it possible to add an overdrive unit to a standard
4speed or
> > > are the gearbox and overdrive setup a single unit?
> >
> > It's theoretically possible to add overdrive to a standard
> > 4 speed, but you have to change some internal parts in the
> > tranny. (the mainshaft being the main one, it has to be a few
> > inches longer)
> >
> > The problem is that the parts you need to put in are
> > non-wearing parts, so not generally made as spares in
> > any real volume, so you can't just call up a parts dealer
> > and get one.
> >
> > The usual and generally only way to get these parts
> > is to take apart an overdrive tranny.
> >
> > So generally, it's almost always easier to just put
> > in the gearbox and overdrive from an OD car. Unless you
> > have a freshly rebuilt box, and you source a worn
> > out box, and you want to swap a lot of parts. ;>
> >
> > --
> > Trevor Boicey, P. Eng.
> > Ottawa, Canada, tboicey@brit.ca
> > ICQ #17432933 http://www.brit.ca/~tboicey/
> > Now if you'll excuse me, I'm gonna get my drink on.
>
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