Topic: Vibration after duals

[surfindave]

Hey Guys just fitted me dual cases and the rear drive shaft is 910mm long same as the front im using a cubal cardan front and rear.
The only problem ive got from the install is i have a vibration at 18-22kph mainly in drive doesnt when coasting .
Can speed upto 120kph no problems no vibes .
Would i be best just too leave it i can put up with it as  dont go 20ks that often and if i hammer down then dont feel the vibe .
Any help appreciaed.
Dave

[Prismo]

My 4-runner vibrates even with the CV driveshaft. The pinion angle is still too great.

[mr4x42u]

that would be my first guess,,is drive shaft angles  or out of balance drive shaft..

[surfindave [OP]]

Yer i have a feeling it may be the drive line angle but being the coil susp its a pita to change .
Do you rekn it is ok to leave the vibration will it have any long term affect on the truk ?
Like i said its only at low speed .
Cheers Dave

[BUBBA]

Did you use a used shaft for the rear? It could be a bad joint.
Try swapping out the driveshafts if they are the same length.

[MiniSimp]

Could also be your pinion angle.
Remember these golden rules....


More here:
http://www.4xshaft.com/techinfo.html

[germ]

The only long term problems:
1. Early U-joint death
2. Possible seal (t-case and rear pinion) death

I would also try turning the drive shaft 180 degrees. Sometimes it will help (don't ask why...I dunno. Saw it as a suggestion on another board, and tried it, and it seemed to help)

good luck
Erik

[Prismo]

Yer i have a feeling it may be the drive line angle but being the coil susp its a pita to change .
Do you rekn it is ok to leave the vibration will it have any long term affect on the truk ?
Like i said its only at low speed .
Cheers Dave

I have had the crush sleeve loosen twice in 200,000 miles, solid spacers should solve this. Grease the driveline like it is a religion & the u-joints will last quite a while. It is easier to put a leaf sprung housing & leafs in than trying to rotate the coil sprung housing.

[surfindave [OP]]

Thanks Guys
The Unis were changed in the cardan joint with new 1s when i had them built .
So i dunno if that is the prob i will try turning it around 180deg see what happens .
most people here say leave the vibe as i may make it worse at my normal 80-100k driving and even offroad i dont go the 20k it is either faster or slower.
Yer i would rather change pinnion angle but like prismo said its easier on a leaf than a coil runner.
Ill monitor it and see what appens .
How often would you grease the unis?
Like once a week or like 500ks?
Thanks Guys realy appreciate the help.
Cheers Dave

[mr4x42u]

check to make sure the slip yolk is in phase with the rest of tha shaft,,that will case a vibration also...

[surfindave [OP]]

Shaft is in phase