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Re: MGB Overdrive/Driveshaft

To: "BILL SCHOOLER" <>, <>,
Subject: Re: MGB Overdrive/Driveshaft
From: "craig wiper" <>
Date: Wed, 4 Dec 1996 17:04:22 -0800
I can attest to the driveshaft being the same. I installed an overdrive
transmission on my early '74 B in October. I pulled the old driveshaft off
of the donor car and removed mine. They are identical.
Craig Wiper
early '74B

> To:;
> Subject: Re: MGB Overdrive/Driveshaft
> Date: Wednesday, December 04, 1996 11:29 AM
> JKearman wrote:
> >I notice that MGBs with Type-D overdrives had vacuum switches, as well
as the
> >driver's switch and the switch in the transmission that inhibits the o/d
> >unless you're in 3rd or 4th gears.
> >Cars with Type-LH overdrives don't have the vacuum switch.
> >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,
> >"passing gear" on a automatic transmission. This seems like a "good
thing." I
> >wonder why it wasn't used in the later cars?
> >Also, anyone in the Northeast US have a driveshaft for an O/D car (73)?
> >guess it's a little shorter than the shaft used on a non-O/D car.
> >Also need the column-mounted combination wiper-O/D stalk.
> 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.  This switch, and the 
> protection it was supposed to provide, was deemed unnecessary with 
> the newer overdrive unit.  And the driveshaft is the same length for 
> all models from 1968 on.
> Bill
> Jim
> 73B

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