I didnt realize that was a thing.Probably left hand threads on the truck. I've got a bucket truck and a gooseneck with lh threads. I hatem. Gotta watch guys a the tire store. They have rungem off quick before with impact guns and just say "sorry".
Pretty common on trucks and trailers and that looks like the door of the old Isuzu we had and a quick Google search shows they used lh lug nuts. It was a pretty good truck.I didnt realize that was a thing.
Meaning: Using lh threads for lugs.
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I have also seen and worked on some older cars that had left hand thread spindles on the left side and right hand threads on the right side. The spindle nuts tighten the wheel bearings and were also retained with a cotter pin.