Well I went 4 miles on Friday morning when my drive chain went. I have not torn it apart yet just rode our XC 600 all weekend. I am looking for some pointers from people that have had the chaincase apart with the reverse gear. I have had others apart without it & would like to know if it is really difficult to work with (take in to fix), or if I should get into it myself. I have always worked on my stuff myself. Thanks in advance.