As others have stated, it's much easier to pick up a gearbox that
already has o/d on it. Bolting an o/d unit to your non-o/d gearbox is
harder than it sounds. It requires a new mainshaft, because
o/d-equipped gearbox need a different lenght mainshaft. Two problems
here: finding an o/d spec mainshaft (hard to find as well as
expensive), and installing the new mainshaft requires complete
disassembly of the gearbox.
If you can find a gearbox with o/d for sale, it's easy to slip it right
into your car. However, since you have a 1970 car, you need a gearbox
with A type o/d, because a J type box won't bolt up to your gearbox
mount. If you want to fit a J type box in your car, you'll need to
modify the chassis mounting points. I believe there may be a kit out
there for this, but not sure.... There is no difference in drive
shafts, but you will have to add the o/d switch on the steering column,
and wire it all up. Dead easy to do though, TRF sells all the pieces.
I put an A type in my car, no problems.
Best thing, find an A type-equipped gearbox for sale and throw it in.
Or, you could always go with the Toyota 5 speed conversion. The price
would probably be similar, and you'd get that legendary Toyota
reliability!
Tim Holbrook
1971 TR6
--- Eric Myracle <eric_myracle@hotmail.com> wrote:
> From: "Eric Myracle" <eric_myracle@hotmail.com>
> To: <6pack@autox.team.net>
> Subject: OD tranny
> Date: Thu, 13 Jun 2002 21:38:47 -0400
>
> Hello list. As I was driving around with the top down today I
> thought
> "it sure would be nice to have overdrive on this thing". How much
> work and cost is it to retrofit a non-OD TR6 (1970 model) to have OD?
> Can the OD be appended to the tranny, or is it best to find a
> tranny+OD assembly and the shorter driveshaft all from a different
> car? I guess I'd need a relay and an interior switch too (were they
> on the dash, steering column, or shifter?)
>
> Thanks,
> Eric
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