bad vibes need help

[2 fast z28]

hay guys like the title say I got some bad vibes with my car at around 60 ish mph and the some what go away a little faster and then they are there again, had my drive shaft shorten and balance like two weeks ago due to installing a 727, just checked all of my drive line angle and here they are trans is 1 degree up, drive shaft is 5.00 up and rear end is 3.50 down now does this sound right when I do the math trans and drive shaft is 4 degrees working angle and the rear is 1.50 I think of working angle so do I need a 2 degree shim or do I need more ? the vibration sounds to me like a u joint its there and then its not did balance my wheels to and they all balance to zero any help would be great

 

[Supershafts]

balance the shaft again.

 

[1968FormulaS340]

Unbolt the driveline, turn it 180 degrees, and bolt it back in. This may or may not do anything but it's free.

If it does nothing, refer to post #2.

 

[Bad Sport]

Sometimes the above check will yield good results, sometimes not. Certainly worth a shot as it is free.

When you had the shaft shortened and balanced, did they check for run out? I would ask them if they did, if they don't know what you are talking about, find another shop.