If the bearings have never been serviced, they should be removed and inspected BEFORE you do the Zerk fittings. Who ever does your bearing inspection/repack and new axle seals can verify you have Ultra-lube axle spindles at the same time. Once they are packed and the Zerks installed, you can use the flow through lube change without worry.
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Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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