I already looked up how to do it, I used the Clymer guide and from looking at various other threads. So at this point, I am actually going to do both things. I am going to purchase a used final drive, and also replace the o-rings on this one. Also, I have NOT removed the outer seal yet. I have only done a tear down up to the outer seal. I have read about the difficulties in taking that one out, so that is why I have NOT removed it. I do appreciate your input.