Okay, so this is pertaining to a S30. I was doing some thinking last night, but a lot of people are running S13 coilovers (which I'm hoping to do as well). So I was thinking what if we were able to use the 240sx hub since we are using the lower mount on the coilover setup. I took a look at a few pictures last night comparing the hubs and how they set on their respective cars.
The biggest issue is where the tie rod ends connect. They are on opposite sides. If we were to swap the 240sx hubs on our car, then we would have to flip them around (so left on right, and right on left). However, the issue with that is the brake caliper will be placed on the front rather the rear.
The major pros that I can see to this (if it all works that is), would be the ease of doing a five lug swap (in the front) and we would be able to use a plethora of brake kits (z32, z33, even evo and sti brembo setups).
I think that the issues really come down to the steering arms, I don't know what the size of our tie rods are, or even the lengths that would be needed in doing this swap. I don't know if we'd be able to use our stock inner with a S13 outer (also if we can use the S13 outers that means we can get longer/adjustable units).
Does anyone else see any issues that we may encounter by doing this?
S13 suspension
http://www.dealerdirectparts.com/v/vspfiles/photos/3713065.gif
S30 suspension
http://www.atlanticz.ca/zclub/techtips/explodedviews/280z/77fsm/front%20suspension%202nd.gif
Take a look at the pictures, and take notice of where the tie rod goes.
So we would use the S30 control arm, the complete S13 spindle (on opposing sides), and S13 coilovers. This would eliminate the need to do any cutting and welding (sans the coilover mount). I think the biggest issue is going to lie with the tie rod ends, but I don't know what else could be. Hopefully someone can chime in!