Any ideas on why my steering shakes?

[DrT]

For some time now I've had a problem where if I drive my Discovery over 60mph and I hit a bump (even a cat's eye) the steering seems to go into some sort of resonance and shakes violently. I can still steer and brake but the shaking is horrendous. If I let the Disco slow down of its own accord then at some speed around 40 mph it suddenly stops shaking and returns to normal.

I've replaced the steering damper, replaced the swivel hubs and all the bearings in them. Checked the preload. It still does the shakes.

Any ideas?

Tim

[J.D.]

Check the following:

- All steering arm ball joints.

- Steering column ball joints.

- Propshaft UJs.

- Wheel Nuts.

- Bearings (grab wheel when vehicle is jacked up and check for play by wiggling it up and down and side to side.)

[Range Rover Blues]

It's called steering kickback and the checklist in the manual goes something like

Steering damper
Radisu arm bushes
Panhard rod bushes
Steering swivel preload

But you also need to check your tracking.

Let me guess, you've got 235/70s on too?

Still got steel wheels? :o

The larger the second moment of area in the front wheel, the worse it gets.

Turn your tracking toe out and try messing around with the bushes on the steering damper, I found if I loosened mine it got better.  Polybushes are the worst thing you can do BTW, the tighter you control the axle, the worse the problem seems to get.