"Clean Neutral" = N after 3rd that basically places the trans in neutral (all bands/clutches exhausted).

"Safety Neutral" = N after 3rd that exhausts all bands/clutches EXCEPT the direct clutch. This keeps all components rotating at engine rpm and does not allow the direct drum to spin out of control.

Check out 727Specialist on the board for Griner Engineering Transbrake 1222G20 or 1222G20B for band apply; 1222G25 or 1222G25B for Safety Neutral feature.