If so will I loose my loot on my PS4 or affect it or anything? The reason for this is because I want to download the other 5 classes on lvl 70 to 360 then transfer all of them including my monk back to my ps4. I cannot transfer any of these modded saves right now as this would delete my only character which is the Monk and loose all my sets and other loot. Is this possible?
You cannot export any save (same or cross platform) to an older generation console. Source: http://us.battle.net/d3/en/blog/15058023/pick-your-platform-keep-your-save-8-18-2014 Q. Will I be able to transfer my save file from PS4 and Xbox One to PS3 and Xbox 360? No. You may only transfer your saves forward (i.e. from current-gen to next-gen platforms), not backwards (i.e. from next-gen to current-gen platforms).
Okay so I found possibly another way that may work. Will uploading my ps4 (monk) save to a usb then import the other 5 classes from 360 to ps4. Then I could transfer my ps4 save(monk) back. Will that work?