Are you replacing the wobbel box, or rebuilding it every yearIJ Over greasing a wob box can be just as bad as not greasing... If you are rebuilding every year, and are not over greasing, you may want to purchase a new box. could be evil demons have taken over your box...(something not obvious is wrong) If you are purchasing a new box every year and still knocking then out.. you have something wrong els where,, Have you locked out your varible speed header driveIJ Running it to fast is verry bad.. you can slow the header down even more by changin the drive pulley,, i dont have the part number with now but i could get it if you want to try this....