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
craigw@sonic.net
http://www.sonic.net/~craigw
----------
> From: BILL SCHOOLER <bschooler@uhd2.uhd.com>
> To: mgs@autox.team.net; JKearman@aol.com
> 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,
like
> >"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)?
I
> >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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