Hang in there as i am working on building this Article.   Firstly, have all your parts cleaned and prepped, identified and ready to fully assemble. Seals, front and rear mains. Drive your seals in with the tools provided in the cummins kits. the rear is easier and the open end goes towards front. The front main is a PITA but once you get it driven as far as the tool will let you it will hold. Leave the install sleaves in them, if you have to remove them pull them out and to replac