
I would use OEM Motorcraft ball joints. I installed one of them and found after installation that it doesn't need to be lubricated. I tried everything but apparently the inside wasn't handled properly. After a few months it started squeaking like crazy and so far I haven't been able to lubricate it. Eventually I filed a warranty claim, which meant buying another joint, swapping it out, and then sending the old one back for a refund. The new joint I received wasn't made properly for the oiler. It took me 30 minutes to fix the thread and install Zerk. Luckily this one needs lubrication so I installed it. If anything goes wrong for me I go back to OEM sealed ones, they have lasted me 250,000 miles.

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