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Pete,
Where are the rubber bushes on the Jag steering? I'd probably put the vagueness down to wheel alignment. You might need a bit more positive casto or toe in to keep it tracking straignt.
One of the things with front suspensions where the steering rack is behind the A arms, as the suspension bushes wear and distort over time it adds toe out to your steering.
The factory Jag XJ6 front suspension bushes are actually pretty good. The inner lowers are a metalised rubber and are fairly rigid. The inner uppers are more a bearing than a rubber bush. They don't twist like a rubber bush they have greased inner and outer race that slide over each other. Most of the time you can get away with just repacking them. I wish my later model Jag had them.
I'm using some quite rigid eurethane bushes in the Jag front on my Cobra and I'll be interested to see how they perform.
One downside to eurethane that Ant has mentioned is the grit and grime. Eurethane isn't designed to be mounted rigid and twist like rubber bushes. It needs to slip as the suspension moves. This means it's got to be greased properly when assembled. unfortunately the grease dries out and dust and dirt adheres and you end up with squeaky suspension. It's probably a good idea to strip your eurethan bushes every few years and re grease them to keep them working well.
Cheers
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Mike Murphy
Melbourne Australia
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