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I've swapped OD gearboxes into two CBBs. In both cases I used the gear
levers from the original non-OD transmissions. I don't see any reason
that you can't use the gear lever you already have for the OD box.
As to the OD switch, I'd put it on the dash if I had an open spot for it
that was handy to my right hand. In the CB cars the wiring and switch
are already installed but there's no reason you can't find the white
circuit that Paul mentioned and run a wire from it to your switch and
from the switch to the lockout switch on the OD box. Looks like there
are a couple of switches in the Moss catalog that would look OK on the
dash. The switch is just a SPST that can handle the solenoid current.
My $ .02,
CR
On 11/11/2019 7:35 AM, Andrew Lundgren via Mgs wrote:
> I have a '78. The transmission is a blue label, but the seller doesn't
> have the shift lever.
>
> A lever for a '78 is not a cheap thing, and my son who is driving it a
> lot right now likes the Walnut MG logo shifter it has. So I'm looking
> at options for how to install the O/D switch.
>
> From the moss catalog, it looks like the '76 switch won't work with
> the '78. So I might have to buy the parts to put together the shifter
> switch or put it in the blank accessory switch above the fan on the dash.
>
>
>
> On Mon, Nov 11, 2019, 1:45 AM PaulHunt73 <paulhunt73@virginmedia.com
>
> None of that is to do with the OD itself.
> Which gears it operated on is a function of the linkages on top of
> the gearbox, and you can have it on 3 and 4 or 4 only as you
> wish. When the TCSA was introduced in late 76 to control
> 'surging'Â a third switch was added to the top of the gearbox that
> operated in 2nd and 4th, and this was wired in series with the OD
> switch operating in 3rd and 4th to produce a 4th gear only output
> controlling the TCSA and vacuum advance. I suspect that was not
> very reliable as it was an external micro-switch so it was deleted
> and the gearbox components changed so the switch operated in 4th
> only, as done to the V8 several years previously. The gearbox
> switch now controlled both OD and TCSA.
> The gear lever itself changed for the 77 model year to incorporate
> the OD manual switch, but that can also be fitted to any year, or
> the 77 converted back to some other switch, as you wish.
> The wiring prior to 77 was from the manual switch on the dash or
> the column, to the gearbox switch on a yellow and a yellow red,
> then from there to the solenoid. For 77 on it was from the
> ignition supply on a white to the gearbox switch, then from there
> to the manual switch on the gear lever, and from there to the
> solenoid.
> Black label or blue label determines which speedo is compatible -
> black label was used on CB cars and used a 1280tpm speedo. Blue
> label was used on RB cars and used a 1000tpm speedo. But speedos
> can be recalibrated if you end up with the wrong combination.
> So as a 78 it should have a blue label OD and the manual switch on
> the gear lever, as the column switch - which together with the
> plastic dash was new for the 77 model year -Â won't have that
> function. But if the car has the earlier RB dash and column
> switches you don't need the gear lever switch, which is prone to
> shorting out and causing harness damage.
> PaulH.
>
> ----- Original Message -----
> Not so much. It will be a a bit still until the transmission
> arrives. (Freight from NY to UT) I'm just trying to figure out
> which shifter it should have had as well as which gears it
> should work on.
>
> I'm going to be putting it into a 78, but the current owner is
> still trying to track down the shifter from his friend, the
> previous owner. He doesn't know if it was a late shifter or an
> early one.
>
> I'm trying to determine how to wire it in.
>
>
> _______________________________________________
>
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I've swapped OD gearboxes into two CBBs. In both cases I used the
gear levers from the original non-OD transmissions. I don't see any
reason that you can't use the gear lever you already have for the OD
box. <br>
<br>
As to the OD switch, I'd put it on the dash if I had an open spot
for it that was handy to my right hand. In the CB cars the wiring
and switch are already installed but there's no reason you can't
find the white circuit that Paul mentioned and run a wire from it to
your switch and from the switch to the lockout switch on the OD
box. Looks like there are a couple of switches in the Moss catalog
that would look OK on the dash. The switch is just a SPST that can
handle the solenoid current.<br>
<br>
My $ .02,<br>
<br>
CR<br>
<br>
<div class="moz-cite-prefix">On 11/11/2019 7:35 AM, Andrew Lundgren
via Mgs wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAKr3Jn3bgMytp+pr8TqSvN0HkkFi=Rjejm5rKVT=9Kej5L9juQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">I have a '78. The transmission is a blue label,
but the seller doesn't have the shift lever.
<div dir="auto"><br>
</div>
<div dir="auto">A lever for a '78 is not a cheap thing, and my
son who is driving it a lot right now likes the Walnut MG logo
shifter it has. So I'm looking at options for how to install
the O/D switch. </div>
<div dir="auto"><br>
</div>
<div dir="auto">From the moss catalog, it looks like the '76
switch won't work with the '78. So I might have to buy the
parts to put together the shifter switch or put it in the
blank accessory switch above the fan on the dash.  </div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Nov 11, 2019, 1:45 AM
PaulHunt73 <<a href="mailto:paulhunt73@virginmedia.com";
moz-do-not-send="true">paulhunt73@virginmedia.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#ffffff">
<div><font size="2">None of that is to do with the OD
itself.</font></div>
<div>Â </div>
<div><font size="2">Which gears it operated on is a function
of the linkages on top of the gearbox, and you can have
it on 3 and 4 or 4 only as you wish. When the TCSA was
introduced in late 76 to control 'surging'Â a third
switch was added to the top of the gearbox that operated
in 2nd and 4th, and this was wired in series with the OD
switch operating in 3rd and 4th to produce a 4th gear
only output controlling the TCSA and vacuum advance. I
suspect that was not very reliable as it was an external
micro-switch so it was deleted and the gearbox
components changed so the switch operated in 4th
only, as done to the V8 several years previously. The
gearbox switch now controlled both OD and TCSA. </font></div>
<div>Â </div>
<div><font size="2">The gear lever itself changed for the 77
model year to incorporate the OD manual switch, but that
can also be fitted to any year, or the 77 converted back
to some other switch, as you wish.</font></div>
<div>Â </div>
<div><font size="2">The wiring prior to 77 was from the
manual switch on the dash or the column, to the gearbox
switch on a yellow and a yellow red, then from there to
the solenoid. For 77 on it was from the ignition supply
on a white to the gearbox switch, then from there to the
manual switch on the gear lever, and from there to the
solenoid.</font></div>
<div>Â </div>
<div><font size="2">Black label or blue label determines
which speedo is compatible - black label was used on CB
cars and used a 1280tpm speedo. Blue label was used on
RB cars and used a 1000tpm speedo. But speedos can be
recalibrated if you end up with the wrong
combination. </font></div>
<div>Â </div>
<div><font size="2">So as a 78 it should have a blue label
OD and the manual switch on the gear lever, as the
column switch - which together with the plastic dash was
new for the 77 model year -Â won't have that function.Â
But if the car has the earlier RB dash and column
switches you don't need the gear lever switch, which is
prone to shorting out and causing harness damage.</font></div>
<div>Â </div>
<div><font size="2">PaulH.</font></div>
<div>Â </div>
<blockquote style="BORDER-LEFT:#000000 2px
solid;PADDING-LEFT:5px;PADDING-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px">
<div style="FONT:10pt arial">----- Original Message -----
</div>
<div dir="auto">Not so much. It will be a a bit still
until the transmission arrives. (Freight from NY to UT)
I'm just trying to figure out which shifter it should
have had as well as which gears it should work on. Â
<div dir="auto"><br>
</div>
<div dir="auto">I'm going to be putting it into a 78,
but the current owner is still trying to track down
the shifter from his friend, the previous owner. He
doesn't know if it was a late shifter or an early one.</div>
<div dir="auto"><br>
</div>
<div dir="auto">I'm trying to determine how to wire it
in.</div>
</div>
</blockquote>
</div>
</blockquote>
</div>
<br>
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<pre class="moz-quote-pre"
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