Have a 2005 3010 Trans mule with 700 hrs. When in 2wd or 4wd either front end knocks bad about every 5-10' of travel. Got the manual and thinking its the front dif. Jacked up the front tires and spun driver side until knocking. Noticed that the other tire will spin freely or just stay still but some times when the noise hits it seams like it locks something up in the dif and then turns the other tire the opposite direction. Oil was recently changed and the right type was used. Looks to have some eveidence of really fine metal particals almost like dust but nothing drastic. I dont believe the locking up is in the rear either cause the noise is for sure in the front. Front drive axels seam to be fine. Any help on how to proceed would be greatly appreciated.