Make sure the bolt grease hole is installed at 3 o'clock or 9 o'clock position. Sometimes you need to take the weight off the wheel/leaf springs (jack the frame).
I had one that wouldn't take grease. I backed the nut off until it was flush with the threads (protects the threads). Then tap the nut with a hammer and pump the grease. Worked for me.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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