Mud-club

Vehicle & Technical => Discovery => Topic started by: matstrooper on September 20, 2007, 22:21:08

Title: suspension
Post by: matstrooper on September 20, 2007, 22:21:08

can someone tell me what these 3 degree adjustment radius arms do and if you need them for a 2" lift

Title: suspension
Post by: clbarclay on September 20, 2007, 23:32:10

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.

Title: suspension
Post by: matstrooper on September 21, 2007, 07:32:16

so how will  i know if i need them or not

Title: suspension
Post by: Bulli on September 21, 2007, 08:29:21

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!

Title: suspension
Post by: Iain C on September 21, 2007, 09:09:05

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...

Title: suspension
Post by: Guardian. on September 21, 2007, 09:40:21

not needed for a 2 inch lift, its one of those things, technically they are right, but in reallity its not necesary.
i didnt have anything on one with 4 inch springs, and that wasnt that bad, although was noticably twitchy.

Title: suspension
Post by: Range Rover Blues on September 22, 2007, 13:25:27

I'm of the opposite opinion, with a 2" lift you will notice and possibly not like the difference.  Castor correcting arms really need a TD5 prop at the same time, so double the cost of buying them.

Thing is it's an opinion, affected by the way each of us drives, what we want the car for and also the manufacturing tolerances of each vehicle.

Suck it and see like Bulli said :?