When I had my GTO off the frame, I was doing alot of measuring and checking, because I was really thinking about raising my trans tunnel so I could get the tailshaft up a bunch. I could only get my driveline angles within about 4 degrees. In other words 3 deg down on the trans, 1 deg up on the drive shaft and 3 deg up on the pinion. Like this \/\.
While I was looking I noticed that the pinion was 5/8" off centerline of the frame of the car. This is with Hotchkis uppers not stock. I do not believe this was caused by the uppers though becuase my backspacing puts the tires so close to the frame, that an offset of 5/8" would put one tire against the frame, and the other tire 1-1/4" off the frame. Everything is nearly perfectly centered on my setup. And my control ares are set equal length.
I was thinking about making my driveline in a perfectly straight line, and using the 5/8" offset as my working angle to keep the needles movign in the u-joints since 5/8" over the length of my driveshaft figured out to be right at a .5 deg if memory serves. But it all seemed like alot of work for a little benefit. I have the similar vibrations the Andrew has, and would love to figure it out as well.
So Andrew, are you saying both of your arms are offset in the same direction? I am just thinking out loud, but I am not sure that that is going to scoot the rear end over any, because they are still the same length, and that is going to force the rear end to the center. If the arms were parallel, obviously the rear would scoot over by the amount of the offset, but the triangulation seems to me like it would still pull the rear to a center location if both arms are the same length.
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