1999 foreman 670 front diff knocking noise

Troy.Huggins said:

I got a 1999 Honda foreman 400 that has been bored out a 670 and when I got it the front diff was busted wide open and i replaced it with one out of a 1999 Honda foreman 450 es that was flooded out about 3 months ago I went to creekside in splendora Texas and when I came out of a deep thick hole heard it knocking so I loaded up and went home but I still dk what the noise is so I need some help

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Did you bore it to a 670, or did you buy it from a guy that says he did? Either way it doesn't add up, even with a stroker crank I don't see how that is possible. Got any pics of it?

Onto your front diff... So you replaced the front diff with a used one that had been flooded? Do I need have that right? After you got the used diff, did you disassemble it, or at minimum flush it out? How smoothly was everything rotating when you got the used diff?