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Hey guys, I need a new frame for my 05 400ex. I have a friend who will give me a frame for an 01 400ex. Will my engine and stuff fit inside this older model frame?
 

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Yes, the frames are identical. They rarely ever get changed. I have an 08 that has parts compatible with an 01.
 

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the swing arm is longer on the 99-04 frame

That isn't going to matter. the pivot bushings,carier axles are all the same. Why would it be longer?
 

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Agree^^^^^^^^^ I looked all over the net and could not find any info to support this. I am not sure on that. I found info of a stock swingarm length to be 18.25. Thats the best I could find. Did not specifi a year.
 

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I have a '99-'02 service manual and a '05-'09 service manual and I can't find anything about the length of the swingarms. On the other hand, I did find that the overall length of the '99-'02 is listed as 72.2 inches and the overall length for the '05-'09 is listed as 71.7 inches. Whether the difference is in the length of the swingarm, I don't know.
 

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Very possible, the 04/05 TRX450 has a shorter swingarm than the 06+ models. A bigger stance equals more stability. That is why most after market a arms don't only go wider but they push your wheels forward.
 

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Is till would like to know where the difference is!
is it possible that the different years came with different size tires and so that could affect the measurement?
 

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yes the old style 400ex's have a longer swingarm im not saying it wont work the just shortend it up on the newer ones. i knw this b/c i have a 06 and a 04 and my 04 is longer than the 06 when side by side.
 

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The frames are the same so the swing difference shouldn't matter.
 

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it is good fro stability especialy hill climbs and stuff i can tell a difference when i go to ride wheelies on the 04 and the 06 the 06 is easier bc it has a shorter stance.
 

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Yeah that makes sense. I'm getting ready to put a 400ex swing on my 250X I will gain about 4 inches.
 

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you have to change up the lighting
 
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