Curve Ball Discovered

FIRST LINE sheds light on the common challenge of replacing the lower suspension arms on the Land Rover Discovery III/IV or Range Rover Sport.

When motorists complain of a clunking noise or a progressively loose steering, it may be indicative of a worn bush or ball joint. Under normal conditions, suspension arms typically need to be replaced at around 75,000 to 85,000 miles due to the wear of the rubber bushes which if left may have a knock-on effect on associated parts.


In the case of the Land Rover Discovery III/IV or Range Rover Sport, problems can occur when removing the rear bush bolts of the front suspension arms. The bushes in the arm have a metal sleeve running through them, which the bolt goes through. Over time, exposure to the elements can cause rust to form, fusing the part together and making it near impossible to loosen or drive out.

If manoeuvring the part with penetrating oil does not release it, many technicians are left with no other choice but to cut through the bolts, in order to enable full removal of the arm.


Depending on the model, some arm bolts are eccentric, with a matching eccentric washer. These are used to set the camber and castor angles correctly. Thus, before removing the bolts, it is recommended that the existing bolts and washers are marked to help identify where they are located in the chassis mounting later on. This will help position the new arm when it is installed whilst minimising the amount of steering realignment required at the end of the job. That said, First Line supplies new nuts, bolts and washers with their suspension arms and these too can be marked during replacement.

Remove the tie rod ball joint nuts, then the lower arm ball joint nuts followed by the adjacent bush bolts. This allows the arm ball joints to be disconnected from their respective hubs, along with the tie rod ball joints. Once completed, remove the rear and front bush bolts from their chassis mounting to release the old suspension arm.

Installers should refit all components in reverse order from their removal and abide by the manufacturer’s torque settings. Finally, check the vehicle’s steering geometry and correct alignment where necessary.


The First Line steering and suspension range continually offers the aftermarket the right parts to getting the job done for an extensive variety of vehicles.


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Published on: September 9, 2020

Filled Under: Technical Articles

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