[Mgs] MGB O/D Driveshafts

[Paul Hunt]

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.


----- Original Message ----- 
>   But as to the measurements:  when I removed mine I did not know where
> to measure. The substitute from the parts car was same length. Mine is 72
> GT with OD, and the parts car is 73 with OD, so they were either both
> correct or both incorrect.  The new one is same length as both the old
> ones when all are fully compressed, and none was any of the quoted
> lengths.  There may be a measurement protocol for driveshafts?

> Hi Paul,, your second line is interesting, that would lead you to say
> that then the dimensions given for sizes don't mean anything since we
> can not figure out which one goes where.??