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2001 450 fourtrax,2002 450 foreman,2003 350 fourtrax
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Discussion Starter · #1 ·
Can anyone explain to me what would cause the front diff on a 2003 trx350fm to break? I just picked one up for my daughter and the front diff is split wide open. I found another diff but it is broken open as well. Could this be caused by wrong tire size? Or is this a known issue? My 350 has given me no issues yet but now I’m getting a little concerned if there is something I should be aware of.
Thanks for reading and any help
 

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2020 520 rubicon foot shift
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307 Posts
I put a lot of miles on a 350 rancher and my buddies have too. None of us ever had front diff issues.
If you never changed the diff oil and ran it with water in the diff the bearings may jam up and split the case.
 

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2001 450 fourtrax,2002 450 foreman,2003 350 fourtrax
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Discussion Starter · #3 ·
That makes sense with the water but, I was thinking maybe they froze up in the winter. The one is totally split in half. The other has chunks out of the casing like it blew up. Now I need to find one that isn’t
 

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2001 450 fourtrax,2002 450 foreman,2003 350 fourtrax
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Discussion Starter · #5 ·
Thanks, that’s definitely something else to consider
 

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Yeah, you are probably right, it probably had lots of water in it, and froze. You'll just have to replace what you need, and repair it
 
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