Driveline Vibratiion Help

[Discyota]

I have posted this on pirate and a discovery forum without much help, so i figure I'll post here since my truck is now part toyota and you guys are always helpful?

I just swapped FZJ80 axles onto my LR Disco2, there is a thread in the 80 forum if anyone is interested. But now I have a driveline vibe coming from the rear driveshaft. I know its the rear because the front is out right now.

The FZJ80 axle has a 1" offset compared to the LR axle. It is also low pinion vs, high pinion. I never had vibes before, and now have one from 65-80mph or so.

I am running a HD aftermarket shaft from 6-states, and its got a CV at the t-case and 1310 u-joints. Since the swap we put on a new u-joint flange at the pinion end. It has not been balanced since, and think that might be causing a problem, but am not sure if a new round flange vs, the old square flange could cause a vibe like this.

Some info:

Shaft Length: 35"
Shaft Operating Angle: 15*
Pinion Angle: 15*
T-case Output Angle: 5* downwards
Horizontal Angle: about 4* calculated

Should I be vibing with a CV shaft? Any suggestions appreciated

 

[fj40forlife]

Maybe unbalanced right take it to the driveline shop and tell them

 

[LandCruiserPhil]

Is the rear pinion (pointing) lined up with the rear flange of the transfer case?

 

[Discyota]

Is the rear pinion (pointing) lined up with the rear flange of the transfer case?

yep, the pinion angle is perfect for a CV shaft

 

[DaveWest5150]

Have you checked for proper phasing?
that means when you look down the length of the shaft the u-joints line up with each other, this can be "adjusted" where the splines come togetherif they are off by one spline they can cause vibration
good luck ...

 

[RVBtruck]

just as previuosly stated.... balnce and phase are the leading causes of high speed vibration. As long as all joint are good.