I went through something similar with my dad's overdrive, everything worked
fine stationary but was intermittent on the road. We bypassed the 3rd/4th
gear switch and it worked perfectly on the road (be really careful if you
decide to try that). The switch itself works fine but it needed to be
reshimmed. There are little paper shims that you use to adjust the switch,
typically you will use zero or one of them. Perhaps you should try
resimming the switch, although I'm not sure it can be done with the
transmission in the car.
James Nazarian
71 MGB Tourer
71 MGBGT V8
85 Dodge Ram
----- Original Message -----
From: "Richard" <ramsmgb@cox.net>
To: <mgs@autox.team.net>
Cc: <ebk@frontier.net>
Sent: Sunday, September 28, 2003 3:01 PM
Subject: mgb overdrive
> Hi listers's:
>
> I have a 1972 with an original Laycock overdrive and od gearbox. I had
> the overdrive fail recently. It was working intermittently. I have
> replaced the isolation switch, all the o rings, sump filter, and the
> solenoid. It worked intermittently after I replaced the isolation
> switch, but now nothing. All the wiring checks hot down to the solenoid
> with the ignition key on, the overdrive switch on, and the gearbox in
> 4th.
>
> Any ideas?
>
> Rich in Tucson
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