[Mgs] MGB O/D Driveshafts

[Dodd, Kelvin]

And there I go adding another dimension. The weld to weld dimension was
used because many of the driveshafts in our scrapyard had the sliding
yoke missing so one could not measure the full compressed length.

When making a driveshaft, the manufacturer will want the static length,
with suspension on the ground, then will add some fudge factor to ensure
the splines will be safely seated at full suspension extension, yet
there is still a bit of clearance at rest.

For us new parts people. Measuring the driveshaft with the yoke fully
compressed is easy and gives an idea of the rest length between the
transmission and diff. flanges.


Kelvin Dodd


> -----Original Message-----
> From: mgs-bounces+doddk=mossmotors.com at autox.team.net [mailto:mgs-
> bounces+doddk=mossmotors.com at autox.team.net] On Behalf Of Paul Hunt
> Sent: Tuesday, September 25, 2007 8:02 AM
> To: Bob Howard; paul at ece.rochester.edu
> Cc: mgs at autox.team.net
> Subject: Re: [Mgs] MGB O/D Driveshafts
>
> Hmmm, this is getting confusing.  I've spoken to one manufacturer who
says
> it is measured prop-shaft flange to prop-shaft flange fully
compressed.
> Then another says to take the prop-shaft off and measure gearbox
flange to
> axle flange, then he will make one to suit.  He said he would give it
a
> sliding joint of quote 1 3/4" to 2" and it would run in about the
middle
> of
> that unquote.  Now whilst I would be happy if the maximum compression
left
> 1/8" to go, I certainly wouldn't be happy if the maximum extension
only
> left
> 1/8" to go!  I tried to get a parts supplier to measure one for me but
all
> he would do is quote 31 1/8" for the 4-synch gearbox (correct) but
didn't
> know how it was measured!
>
> The more I think about it flange to flange of the prop-shaft fully
> compressed makes the most sense ... but then when did common sense
rule in
> our cars?  We need more examples or a definitive statement of how it
is
> measured, I find it difficult to believe that all of Bob's should be
the
> same but incorrect.
>
> PaulH.