Rear Axle Half Shaft Changes.

[Tony Press]

they do! 
Whilst the axle cases DONT change between 670D and F parts lists, the torque tubes do. But there is no seeming difference in the other diff innards, so presume an unrelated event?
Looking at the index card axle changes, I'm now unsure how to interpret - they seem more complicated than Green Companion suggests. And the experimental axle Sept 1930 only seems to be on 82 cars in all.

But what else happened at 126,384 chassis number when the halfshaft changeover occurs, that might have accounted for it?

Well- I wasn't looking closely enough and skipped 'Differential Shaft' - looking for 'Axle Shaft'- which it is listed as in all the handbooks - should have read the numbers !

The axle number change would indicate the diff carrier end diameter change - together with the Bush change.

The lengths shown are 22 1/2" and 23 1/2" - I was looking for any indication of the 'short' axle shaft mentioned earlier.   

 Cheers, Tony.