[wingnut60]

10-4 on the not much room to work.
Any ATF will work, but while at it, full synthetic is probably the way to go--Cummins is using Amsoil and that is a good product to use.
If you come across a line section that won't stop leaking, if possible, remove the section and take it to a hydraulics hose shop--they will make you an identical one of much better quality than Lipperts.
I could never stop the fluid from being present on the connections in the pump area in my '05, yet only had to add extra fluid once in 10 years of use. So don't get too upset if you can't completely dry up the connections, unless it is causing problems with operations. And if I recall correctly, do not use a sealant on the fittings.