I'm with Pat303. Swivel bearings. D1 would hit even small bumps and at certain speeds even 65 kph would shake like a dog - if you didn't slow as soon as safety allowed it almost felt as if the shaking got more severe. Brown underpants moments at times. Particularly bad if you hit a diagonal bump across the road. Chased alignment, balancing, suspension rubbers, bushes, steering damper... tightened pre-load (sorry Pat will look at buying new bearings sometime!) and on the second go problem went away and drives well again... starting to get a similar wobble on the Defender so have to look at that soon...
My D1 has a steering damper on both the drag link and the trackrod !
It steers beautifully on any surface at any speed.
My model doesn't have sway bars.
Cheers.
i have a 94 RRC which is much the same as the D1, all of my suspension bushes are shagged, it clunks horribly when you turn on full lock and go over bumps (radius arm bushes) the panhard bushes arn't the best, i have king springs 2" lifted, the cheapest shocks i could buy at the time (maxitrax - which now leak oil, i just spent $1400 at the time on wrangler mt/r's so was running out of coin) the cheapest steering damper i could get ($60 odd), the ball joint is also stuffed, it has 32" MT/R goodyear wranglers which the rear two are nearly past their use-by date on roh 15" alloys, i had a problem with one rim not balancing up casuing a vibration at 105kph but since having swapped this for my spare rim, it drives perfect on any terrain dead straight without hands on the wheel down the highway (depending on road camber) it even drives nice at 160kph (not that i have ever driven that fast cough cough..
From what i can tell it doesnt appear to have had the swivels done ever, i'm assuming it must have had wheel bearings done but maybe not, i have done one rear side wheel bearings but that is it and its done 250,000km and i reckon the bushes are original too
Check that the bolts holding the bracket for the panhard rod to the chassis are tight and check that the big nut holding the pitman arm onto the bottom of the steering box is tight too.
Probably not what is causing your problem, but both are a known issue.
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