What they said , the OD section is the scariest part the spring in it is rated at 800 psi , you have to be careful. If it were me I would pull that part out of the OD section take it and the new clutches , steels and any other related parts to a trans shop and ask them to rebuild it for you . Otherwise it's just like rebuilding the 727 , get the ASTG manual for the 518 trans and it will tell you all you need to know plus they have good tips added in the rear about known issues and their fixes .