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Hey Peter, how are you doing?
I think the problem with the driveshaft is that most people who do a one piece shaft are using too large diameters, like 3". This, as you say, causes clearance problems. I am talking about 240, but it is probably similar for 700/900.
I run a 2" one piece, which has no clearance problems at all, but it's disadvantage is that you are limited to 120mph top speed because of the critical frequency (or something like that) of the shaft. (It has a somewhat low critical frequency because of it's longish length and the small diameter) You probably are aware of this already.
The ultimate solution with absolutely no problems (aside from cost) is a one piece 2" carbon shaft. This is what I will get eventually. And IMHO, it's not that terribly expensive.
The problem with the 2 piece shafts is that Ross Converse was having some kind of knocking problem on acceleration as the rear axle wants to shift. And I like not having a center bearing and the extra U-joint. The one piece setup (especially carbon) probably is lighter than the 2 piece config. Maybe someone else can clarify exactly what the problem was with the 2 piece setup.
See ya around!
Greg
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