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Hello yall. I have a 13 850 making some bearing noise from what seams to be the rear pinion area. I recently acquired the machine and went threw all the fluids replacing with amsoil. At about 15mph and higher I get a growling noise from rear diff under acceleration that disappears when I release throttle. Should I get that amsoil otta there or is it to late? Or maybe I'm being crazy but its loud and doesn't seam right. No play in driveshaft or any leaks.
 

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Same issue here with my 13 850xp and haven't been able to find a cure. Don't think any fluid will make a difference as it appears to be improper gear lash from the factory. Lots of threads on this but nobody has posted a fix as far as I could find. If you do please let me know!
 
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