Vehicle & Technical > Discovery

Vibration..

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John T:
What can cause diff vibration ??

I fitted new diffs last week and now have a vibration on take off and at arround 50 mph, I do have a 2" lift, but never had any vibration problems before. The only other thing I have done is fit QT radius arms.

Any ideas please.. :roll:

Staffy:
The QT radius arms sound like they could be the cause.

These when fitted tilt the axle back to it's original angle (diff sits level rather than tilted up to the transfer box), therefore the prop is at a more severe angle than it was before, which puts the uj's under a much higher strain. Hence the vibration.

The usual cure is to change the prop.

Phil

muddymart:

--- Quote from: "Staffy" ---

The usual cure is to change the prop.

Phil
--- End quote ---


Dont forget to get the td5 flange as well as its wider and will fit the td5 front prop with the two yokes,

im learning all the time, you should see my back room with all the parts in for the 2" lift, im going to get it all done at the same time....

Good luck !

NY4x4:

--- Quote from: "Staffy" ---The QT radius arms sound like they could be the cause.

These when fitted tilt the axle back to it's original angle (diff sits level rather than tilted up to the transfer box), therefore the prop is at a more severe angle than it was before, which puts the uj's under a much higher strain. Hence the vibration.

The usual cure is to change the prop.

Phil
--- End quote ---


But surley the prop is now back at the correct angle, and should have been a problem before the Qt's were fitted..

Darren:
The castor correcting radius arms are designed to correct the steering geometry, which can be upset by a lift because the axle is tilted forward. They also solve the problem of the UJ's not running parallel with each other when the suspension is lifted, which puts extra strain on the joints, although that's not their prime purpose. However, this does mean that the whole propshaft does run at a steeper angle, which can be on the limit of operation of the original joints.

As suggested above, the solution to that problem is to fit a double cardan jointed prop from a TD5, or a wide angle standard prop, both of which are able to run at steeper angles.

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