GB, I am concerned about your choice of air filters for your 6AT installation. Attached is a link to an old Cummins video about the damage dust can cause to an engine,
https://www.facebook.com/liftedlifet...1266004382770/. If the link doesn't search for Cummins Operation Hourglass.
There was also an SAE paper written on the development of that engine back in 1985 if you would like to know more of the technical details of the engine. The SAE paper number is 850260.