The dipstick changed to a side-fill plug in about 74 (I have a 73 with
dipstick and 75 with side-fill) but you could have any gearbox.
Green and green/brown is the reverse-lamp circuit. There was also an o/d
inhibit switch (yellow/red and yellow/purple, where fitted) and a neutral
switch for the seatbelt warning (green and light-green/white, late 72). I
believe the O/D and reverse switches are interchangeable and therefore
identical, whereas the seatbelt switch is smaller in diameter but has a
longer threaded portion.
PaulH.
----- Original Message -----
From: William T Snyder, II <wtsnyder@juno.com>
To: <mgs@autox.team.net>
Sent: Monday, January 22, 2001 12:49 AM
Subject: Gearbox Questions
> Hello list. In the process of tracing the problems with reverse lamps
> that do not function on my non-OD '72 GT, I have become a bit puzzled.
> First, I cannot find a gear box dipstick/filler port. I located the
> rubber plug under the carpet behind the radio console on the top
> passenger side of the tranny tunnel, but could feel or see no dipstick or
> plug underneath. I jacked up the car and got underneath the passenger
> side and felt all along the top of the gearbox and still no luck. Am I
> mistaken that the later gearboxes had a dipstick as the earlier cars did?
> If not, where do you refill the gearbox after draining and how do you
> check the level?
>
> Secondly, above the speedo angle drive on the passenger side again is a
> switch with two electrical contacts to which a green and green/brown
> wires are attached. I am assuming that this is the reverse switch(?). My
> catalogues and manuals show the reverse switch on the driver's side. Are
> their diagrams for RHD cars?
>
> Above that switch, slightly farther forward on the passenger side of the
> housing to which the shift lever is attached is another switch(?) with 2
> contacts but no wires attached. Can anyone tell me its name or purpose?
>
> Although all of the catalogues and manuals show diagrams of the D and LH
> type OD's, none show how or where they fit onto the rest of the gearbox.
> This may sound like a silly question to you pros on the list, but just
> where do they fit in or on the standard gearbox? If they lengthen the
> overall gearbox length, I assume a shorter drive shaft is also
> required(?).
>
> Lastly, the bolt nearest the starter motor which attaches my gearbox to
> the engine is missing. How important to replace it and what size bolt?
>
> Thanks for your patience and for sharing your knowledge.
> Bill Snyder
> '66 MGB
> '72 BGT
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