Yep, this was a silver bullet for me, because the Commodore driveshaft has a proper CV centre joint so its angle doesn't matter. Allows the front and rear uni joints to be on correct cancelling angles when that would be impossible with a one piece shaft, no more vibrations!Check 76lxhatch's build 'SS hatch' on page 2 as he's done this on his hatchback from memory
http://www.gmh-toran...e-5#entry638425
What happened to work well for me was using the standard length VN rear shaft, and shortening the front only. I made a mount for the bearing which is welded forward to the safety loop, this holds most of the weight and is stabilised by a couple of rivet nuts through the tunnel immediately above it. Requires a second safety loop for the rear shaft which is very tight but do-able.
http://www.gmh-toran...e-8#entry757490
I have a UC parts car with a factory two piece driveshaft here but I've never got around to getting under it to take a good look. I think it has a cardan centre joint so not as useful.