Im new to the nv5600 so I been digging up info on how many qts should over fill. I read everything from 4.5 to 7qt. Im running 6 in it now but if any of you are running 7 Id like to hear from you.
Thanks

I ran 8-9 quarts in mine with PTO coolers, which would have been the equivalent level

of 6-7 quarts without coolers. It shifted great but was a little noisier at idle than with stick levels. 
 

I’d probably go  until it spills and add 1 quart.