Vehicle & Technical > Discovery
suspension
matstrooper:
can someone tell me what these 3 degree adjustment radius arms do and if you need them for a 2" lift
clbarclay:
As the front suspension is lifted the axle is rotated forwards at the top which reduces the steering castor angle. This can lead to poor steering self centering and tramlining which arn't nice or particuarly safe.
It depends, but some people have no trouble with a 2" lift and where as others do.
The arms rotate the axle back by 3 degrees (6 degree arms are also avalible for bigger lifts) correcting the castor angle. The down side is they detrimentally affect the propshaft UJ angles which can cause casing vibration.
Other options include offset bushes between the radius arm/axle which effectively do the same thing, but using standard radius arms Or alternatively relacement/modifed swivels that bolt on to the axle at a different angle to stock items which correct the castor without affecting prop UJ angles.
matstrooper:
so how will i know if i need them or not
Bulli:
trial and error im afraid there really isnt another way. Have you lifted your disco yet?
of not get it done and see how she behaves. I had no issues whatsoever at 2 inch lift. You may be lucky!
Iain C:
Mine was OK too...a little more vague in the steering but hothing to worry about.
Personally for a 2" lift i would steer clear of corrected arms unless you are going to do something clever with your front prop UJs...
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