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I have a 2007 grizzly with a yfm400 engine and it threw a rod. I have located a 2008 yfm400 lower engine & gear case off of a big bear. Does anyone know if these will interchange thanks lee
 

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I have a 2007 grizzly with a yfm400 engine and it threw a rod. I have located a 2008 yfm400 lower engine & gear case off of a big bear. Does anyone know if these will interchange thanks lee

No they are completely different engines and nothing is interchangeable.

Your 400 is liquid cooled cvt transmission, . The big bear is an air cooled motor with a 5 speed trans.
 

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Welcome from Colorado.
You can review the different models here for differences;
 
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