>there was a limited availability option that was supposed to drop you
>out of OD when you put your foot to the floor.
>
I don't think so. I have a 67 MGB with a vacuum switch correctly connected.
It works as described; holding you in overdrive if you have your foot off
the gas.
>>Kearman wrote:
>>>I assume the vacuum switch made the o/d switch out when you got on the
>>>throttle, and let the o/d kick back in when you let off the throttle, like
>>>"passing gear" on a automatic transmission. This seems like a "good thing."
>>>I
>>>wonder why it wasn't used in the later cars?
>
>
>>
>>Sorry mate - wrong on both your assumption and your guess! The
>>vacuum switch inhibited shifting out of overdrive under high manifold
>>vacumm conditions, i.e., you have taken your foot off the throttle,
>>coming down from relatively high rpm.
>>
>>Jim
>>73B
>
>
>I believe you already have the correct switch. just need to connect up
>the overdrive wires. All wiring harnesses were wired for the OD.
>
>>>Also need the column-mounted combination wiper-O/D stalk.
>>
>
>
Phil Bates
58 MGA
67 MGB
75 Jaguar XJ12C
52 MG TD replicar (VW)
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