just drain out old stuff then jackup rear of atv and put kerosene in rear diff. crank up atv put in gear and at low rpms rev up some to let rear drive rotate alil bit to clean up inside then turn off atv an let atv back on ground an drain the kerosene out may have to do afew time to get all of old dirty grit drained out...then refill with gear oil..

 

Alright. Instead of kerosene can i just use the regular diff fluid? I have a lot extra from another project I was working on.

 

Sure anything to flush with will be fine......