Just like DoubleMint gum, you're both right.
Rey did hit upon one interesting point, and that is it would reasonably inexpensive do one halfshaft on a V1. Which one would be an issue (if it even really mattered), and the question wuld be how much would there be to gain ... a 2% reduction in WH (and associated improvement in the longevity of the diff) or would there be an 80% reduction. If it showed minimal improvement, then we'd know and focus elsewhere. If there was a dramatic improvement, then I'd think the market might be a couple dozen or maybe more (depending on price, of course). The experiment assessing the proposed "fix" would have to be controlled: same vehicle, same tires/pressures, same shocks, same pavement, same temps, same, same, same ... just different halfshaft.
I agree that changing to 09 "spec" axles would be a step in the right direction, as to which axle to change, it would seem that should be in keeping with which one is the largest diameter on the 09 - specifically, endeavor to maintain the same ratio of differance between diameters as the 09 has. However, this axle would still not address the reported difference in splines between the 09 diff and the 04-07 V hubs, if the changes were "staged" at a different time. As to trying to adapt the 09 dif to the earlier subframe, I think there is a real advantage to using what the engineers have designed for 09(as well as being an OEM part) to mount and assure the diff is properly aligned and secured - that is the foundation on which the whole project should be based (remember, you may want to go 150+mph in this project,so peace of mind is also relatively important:lildevil

- using as many OEM parts as possible is GOOD, (while also making the conversion relatively reversable, if ever it need be. As has been pointed out before, we are really looking at two problems that happen to be related/interrelated. The axles supposedly address WH, while the diff addresses longevity.That's my two cents worth!
That being said, being as how I have had a maggie in the box, along with other goodies, (kinky, no!

) for almost two years waiting for a diff/launch solution (and my warranty to expire), so as I said, I am ready to move forward to try to solve the problem that keep our V's from being enjoyed the way they should be. Unfortunatley, my fab shop source of 30 yrs, passed away last year, so I would offer my 05 as a mule, and fund the parts (asking Luke to be gentle!!

) if we can find someone in the group that has fabrication facilities/capabilities they could donate (or at least also be gentle

), preferable in the Southeast/East.