F-body driveline angles-1st gen

[armourmark]

I have researched the crap out of this and get a bunch of different opinions. I have a 67 camaro with LS transplant and 4L80e trans. Currently, my angles are trans is 3 degrees down, pinion is 6.5 degrees down (leaf springs) and the driveshaft is 0.6 down- so basically level. The car runs smooth as silk until it gets over 60mph and then I get moderate vibration. The car is lowered and the trans is hitting the floor now so i cannot move it up any. Would a CV joint cure any of this vibration? I really don't want to have to rip the rearend out to have mounting perches cut off and rewelded by someone. I am positive the vibes are due to the driveline angles as I have eliminated all other possibilities (tires balanced, rear end/splines, trans/motor mounts, driveshaft balanced twice). Does anyone know about this magical CV front joint?

[armourmark]

I forgot to mention that I tried some pinion angle wedges and that seemed to make it worse as it had the driveshaft running up (higher at pinion than at trans).

[TheJDMan]

Have you read this thread?

https://www.pro-touring.com/threads/104644-CV-Driveshaft

[armourmark]

I had not seen that thread. I saw another one with Andrewb70 and his GTO issues. I will investigate the u-joints to make sure it isn't something easy like you had too Steve! This damn vibe is k,k,k,k,killing me. haha. It's actually not that bad, but I want to open this thing up some and I do not have the confidence with this vibe happening.