Pull off the 555 and measure the diameter of the shaft at the boot and at the end of the threads by the tapered part. Then do the same on your old one. They SHOULD be the same. If the 555 is smaller, it's a bad part.@BILT4ME guys at marlin got back to me and thought my pitman arm hole has been wallowed out....seems like a long shot no?
Looked at my passenger side 555 and it is now seeping grease from the boot. Will try the washers when I get a chance to pick some up, still seems like that would flatten the boot too much though, or is that not a problem?
For fun I tried my old one....and works just fine at FSM spec.
Found an old thread in the 40 section that looks like same issue too: Brand New Tie Rod Ends - Is this Normal? - https://forum.ih8mud.com/threads/brand-new-tie-rod-ends-is-this-normal.775450/
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Take pics of each, side by side if you can.
The guys at Marlin will accept it if they can see the differences and see it's the part that's different, not the hole it's going into.
I had heard of some "fake" 555 parts a long time ago, but I don't know how truthful that was.