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the thing is you will have to juust about get it to the point that BJ replacement is only 1 more step vs Dust cover replacement. At the point you could replace the dust cover you just as well Press the old BJs out and replace them!!!
If its 4x4 you might have to replace the Knuckle seals to you have about a 50/50 shot at being able to reuse these Knuckle seals as they are pressed in
IMO you either leave it alone or replace the Ball Joints too
And Id lean towards replacment if they have over 100K
The quality of the Moogs are not what they used to be so that said if it was me Id check into a Servicable OEM/Ford BJs. By servicable I mean Grease Zerts
At 150k odds are the joints have already begun to degrade internally, so new boots is just gift wrapping a turd. Put the money towards new parts that'll last instead of a band-aid.
You can probably rent the first two at an autoparts store, so really the $60 seal driver is the only one you 'have' to buy, and even then there are directions somewhere on here to make a home made seal driver for probably half the cost.
Yup, just mentioned it in case somebody with a newer truck stumbles on it. I think the seal design is the same for 05 to current. I bought my seal driver online. Well worth the money