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You probably should replace the whole upper control arm. I don't believe that you can separate the ball joint from the control arm without damaging it and the ball joints are not listed separately for sale. [If the ball joint is bad, the bushings can't be in very good shape, either.]
To replace the upper control arm, you need to take the weight off the spring and pop the ball joint out of the spindle with a special tool OTC 6297 Ball Joint Separator
Then it is bolted in by the 2 pivot bolts [#3 in the diagram].
STOP!!! That ball joint comes in the arm assy. If you remove it, it will damage the thin arm and then you have safety concerns because the new one, although you may get it in there, will likely pop out later. If you're on a tight budget, buy a complete used arm from a local dismantler. Otherwise buy a new complete upper arm.
jack up vehicle ,remove tire/wheel,separate upper ball joint from steering spindle. next open hood, look at the right front strut mount. there is a nut on each side of the strut mount, these nuts hold the upper control arm to the vehicle. remove the nuts and pull the control arm out. install in reverse procedure. NOTE: need to have alignment checked after replacement.
Since the new arm comes with the bushings, there is no reason to get the tool to install them. Upper arms are relatively easy to install...just a bolt out, bolt in operation as the springs aren't involved. Support the suspension under the lower control arm to take any tension off the upper arm.
raise vechicle. support lower control arm assemblies.then you remove self locking nuts upper control arm bolts and upper control anchor bolts. then separate the upper ball joint. dont have to remove coil spring.
Do not disassemble the upper arm. If the ball joint or bushings are faulty, or the upper arm is damaged, the entire upper arm must be replaced.
Raise and support the vehicle safely.
Remove the front wheels. Support the lower control arm assembly with a floor jack.
Separate the upper ball joint from the steering knuckle using a ball joint separator tool.
Remove the self-locking nuts from the upper arm anchor bolts. Remove the upper arm from the vehicle.
Do not disassemble the upper arm. If the ball joint or bushings are faulty, or the upper arm is damaged, the entire upper arm must be replaced. To install: Use new self-locking nuts when installing the upper arm and strut.
Install the upper control arm assembly into the strut tower.
Connect the upper ball joint.
Install the front wheels and lower the vehicle.
With all four of the vehicle's wheels on the ground, torque the upper control arm nuts to 47 ft. lbs. (65 Nm). Torque the castle nut to 32 ft. lbs. (44 Nm); then, only tighten it enough to install a new cotter pin.
Tighten the wheel nuts to 80 ft. lbs. (110 Nm).
Check and adjust the vehicle's front end alignment.
The bushings on the front lower control arms are replaceable on most models. This procedure requires the use of a press and may be above the skill range of the average driveway enthusiast. It is recommended that this procedure be done by a qualified machine shop if you are not skilled in the proper use of a press.
Remove the lower control arm that is in need of new bushings.
It is recommended that both the left and right lower control arm bushings be replaced at the same time. The vehicles handling may become unstable if there are new bushings on one side of the car and worn ones on the other.
Set up the control arm in a press.
Using a impact socket of the correct length and size, press out the old bushing.
Install the new bushing by slowly using the press to push it into the control arm.
WARNINGExcessive force could cause the bushing to bend or tear so be careful.
Once the bushing is properly seated in the control arm, remove the arm from the press and install it on the vehicle.
This is a pretty easy job.The way i do it is take the two 14mm bolts louse from the strut on the inner fender well,then take the 17mm bolt out of the bottom of the strut on the lower control arm this will make it drop down.Then take the 14mm bolt louse that fastens the ball joint to the spindle take a hammer and hit the upper spindle and it all will come apart.Now you will have the two bolts that holds the upper control arm in place these are 17mm bolts drop the strut down and remove the upper control arm now you can go in with the new one.Hope this helps !!!
You're not supposed to replace the uppers on a 98 ranger. They're not meant to be pressed out because its built in with the control arm as a single unit. Just buy new upper control arms and save yourself the trouble. Ford also claims you have to replace the control arm for the lowers as well, but that's BS. They can be replaced fairly easily with the proper tools.