The lower arms #4 and #5 are quite easy to swap out.
Raise and support the car, remove the front wheel on the side you are changing. #4 is attached to the crossmember by 1 bolt and 1 nut holds the balljoint side, there is another bolt connecting the shock/strut to this arm. I've found that removing the bolt from the connection to the strut and loosening, don't remove, the other nuts and bolts, is the best way to proceed. Once loose, unless you have a seperator, you will need to use a persuader aka hammer to get the joint apart. Take care not to damage the knuckle. It caused me many headaches trying to figure out why the dust boots were always getting torn up, damage from b4 I even had the car. Ok, once you have the arm out, start by installing the balljoint side first, then attach the shock fork to the arm, tighten this one, then attach to the crossmember, DO NOT TIGHTEN this one. Get another jack and postion it under the new arm as close as possible to the balljoint. Raise the jack to compress the suspension, until you are almost lifting the car. This should get the balljoint pretty snug and u shouldn't have any trouble tightening the nut. At this point you are pretty much done except for the bolt attaching to the crossmember. Once the wheel is back on and the vehicle lowered, this is when you tighten this bolt (right out of CHILTON'S repair manual) to not get excessive strain on the rubber bushing. For the curved, compression, arm, you do pretty much the same thing just seperate the balljoint first then remove the bolts from the undercarriage. Reverse to install.
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