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RE: MGB Overdrive/Driveshaft

To: Randy Rees <>
Subject: RE: MGB Overdrive/Driveshaft
From: (Phil Bates)
Date: Wed, 4 Dec 1996 18:51:03 -0700
>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."
>>>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.  
>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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