I didnt find any zerk fitting on my ujoints (E450 Axis) but I did check to make sure they were tight .....along with the center drive shaft carrier.
Normally you can get like 75K+ miles out of ujoints (in my experience) and they are easy (and cheap) to replace. So unless your driving off road a lot or heavy loads/towing you should be fine until 75 K miles IMO (but check at least once a year).
On my jeep I started replacing them every 40K miles (or so) to be safe but I make sure I have zerk fittings on new joints and lubed them twice a year.
Jacked up Jeeps that get used off road some go though U joints much quicker.
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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