Honestly.. just get rid of it and get a 70 or a different 60.. all the BS you have to deal with on that axle just isnt worth it go 70.. re gear it.. already have 35spl shafts. Also the 5/8th spacer from what ive read over the years isnt an end all spec, it seems to vary. Also where are you getting that they come factory with 35 spl ? they have the bigger spindles but thats it