driveline angle corrections when lifted " the light fix"

If you have to have all the vibrations gone, throw in the single piece with the double cardan on the front of it.

 

Thanks bud, no, I don't have to have it all gone, this little bit that's left is not bad. BUT, I do want to improve the rear angle some just to now extend the life of the u-joints some and while doing so get a tiny tiny bit of residual raising of the rear by way of the shims to cancel out some of the mismatch of the front being slightly taller than the rear by about a degree.

 

Middle working angle is 1.65(9.35-7.7)
Pinion working angle is 5.05(9.35-4.3)

A 3 degree shim would get you to a 2.05 pinion working angle.
While not quite matching the middle 1.65 working angle(0.5 difference), it should get there under acceleration/driven load as the pinion rises.

A 4 degree shim would get you to a 1.05 pinion working angle(0.6 difference).
Since your problem is under deceleration, it would probably equal out as the pinion dives.

Tough call...

I'd probably go with the 3 degree shim and do something to address axle wrap under deceleration.
You don't happen to have 2" block in the rear, do you?

 

YES exactly. I have 2" blocks under the rear,
And as far as the 3 vs 4 degree blocks. I'm not so worried about the vibration as that seems to be mostly solved now but I am most concerned with whichever one better corrects the pinion angle issue AND whichever one will give me a tiny bit more of additional raising of the rear.

But you have now made me thing of something...... can a wedge be added on to the 2" blocks that are already there or must I now have some sort of custom block made that has the 2" built into it AND the 3-4 degree angle?? wow, I Never thought of that,

 

Your vibes under deceleration are two fold.
One is the working angles; the other is the changing of those working angles under load; in your case axle wrap during deceleration.
Lift blocks have a way of amplifying this affect.

I would suggest against adding shims with lift blocks; too much crap bolted together.
2" blocks with the shim angle built in would be better.
Ditching the lift blocks in favor of AAL or new spring pack would be ideal.

If you go with an AAL or new leaf pack, hold off buying shims. The AAL or leaf pack might change your angles and would require different shims.

 

I don't see myself spending the money for springs and all that jazz. I most probably will try to find someone who will make the lifting blocks with the wedge built in 3-4 degrees as you have indicated. I dont know who makes such a thing off the top of my head but will try to find someone

 

Search "tapered lift blocks"; you're bound to find something.
Another thing you can do on the cheap that will help control axle wrap, is get some bolt-on spring keepers. They basically 'sandwhich' your leafs and keep them from seperating. Install them forward of the u-bolts.

 

Thanks for the good info bud, I will search for the blocks and the spring keepers. Do the spring keepers only go on one end of the spring forwards of the axle or on the rear end of the spring behind the axle, not clear on this.