90s Fords - steering vibration

[hsv_sc]

Hi all, this has been driving me crazy for some time, I wonder if you can help:

If have a Mondeo and Focus, both 1999. They are both over 100k.

They both have vibration in the steering wheel at speed, starting at 50mph and getting worse the faster you go.

Here's what I've changed so far:
Wheels balanced a number of times and even tried a few different sets of wheels
New tyres
Rims checked
Tracking done
Replaced discs and pads
New track rod ends and wishbones

The above has made no difference at all. Has anyone had this problem and what did you replace to solve it?

Appreciate any help!

I'm trying to think what else it could be...
Driveshafts?
Steering rack?
Suspension legs?
Top mounts?
Drop links?
Wheel bearings?
Steering column?

Thanks.

[balders118]

In my MK2 golf the driveshafts went, which caused a lot of vibration through the steering wheels at speed. Infact, the whole dash use to vibrate! A possibility.

[Allyc85]

I had a vibration not long after I bought my mk1 Focus and it turned out to be the drive shaft bearing for the o/s shaft.

[Zad]

80s/90s Escorts and Sierras used to suffer from something similar too. Making itself felt at 65 MPH and only going away above 85 (so I'm told m'lud). The Ford anti-roll bar bushes deteriorated over a few years and allowed the geometry to distort at certain wheel loads, setting up an oscillation. Replacing them with uprated items cured the problem completely. Ford items break down after 4-5 years or so. Wheel balancing etc sometimes masked the problem, but it inevitably returned after a few months.

[JU5T1N]

Have you ruled out sticking caliper?

[hsv_sc]

Thanks guys - I'm gonna go for wheel bearings followed by driveshafts, and arb bushes failing that.