There may be plastic plugs that can be removed and replaced with grease fittings. You can grab a pack at an autostore after you check.
I was always curious about this but never actually checked.
I believe the choice to do it this way would be based on avoiding damage to them during manufacture. I'll have to ask the ZF rep that supplies our suspension components 'cause now I'm curious again.
I asked the ZF rep that question yesterday. He basically said that many stock suspensions simply don't come with provisions for fittings and are considered nonservicable. Not maintenance free he said but nonserviceable. Some aftermarket parts have either nothing, plugs, or fittings.
Three of my ball joints, both outer tie rod ends, and my drive shaft u-joints have them but none of them are original.
Shit! That reminds me, I forgot to grease them today when I did my oil change!
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2011 Ranger XLT, 4X4, 4 door Super Cab. 4.0L, 5 Speed M50D-R1HD, 3.73:1, 8.8" open differential, Jason Pace cap
1999 Honda CR-V EX, RT4WD, 2.0L, 5 Speed MT, 4.56:1, open differential