> -----Original Message-----
> From: mark holbrook [mailto:rolling_rock_12@yahoo.com]
> Sent: Wednesday, June 07, 2000 10:08 AM
> To: nugentmd@gte.net
> Cc: spitfires@autox.team.net
> Subject: Re: O/D switch momentary or two pole?
>
>
>
> This sounds very hard to do to me because of the way
> the switch on the top extension works. The way this
> switch works is that a metal spade from the stick
> shift extension contacts the switch when it is moved
> over to the 3rd/4th gear side, far right. This means
> the car does not know if the trans is in 3rd or 4th.
> All it knows is that the circut is complete and
> therefore overdrive can be selected.
> Mark Holbrook
> --- "Michael D. Nugent, Ph.D." <nugentmd@gte.net>
> wrote:
> > Would it be possible to arrange for the OD to only
> > engage in 4th?
> > (D-type, I think, from a '73 GT6)
> >
> > Mike
> > Renton, WA
> >
As Mark writes, it is hard to do, but not impossible.
Although I am not sure why you would want to eliminate
OD on 3rd gear, what you would need to do is to take
the shift extension off, and machine the front part of
the contacting mechanism off. The contacting mechanism
(for lack of another term), looks somewhat like a
cylinder with a tab on it. This is what contacts the
push button switch. When you are in third gear, the
piece is back, and in fourth it is forward. So by
milling off the front, you eliminate making the switch.
As I said though, why would you not want to be able
to use OD in third? If you don't like using it in
third, then don't use it. Don't be someones DPO by
making a major change.
Doug Mitchell
dbmitchell@bigfoot.com
'73 Spitfire 1500 w/OD
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